Skip navigation

Personal Data

Christoph Helmut Keitel

birth30 July 1965, Lübeck, Germany
citizenshipGerman
addressMax-Planck-Institut für Kernphysik (MPIK)
Max Planck Institute for Nuclear Physics
Saupfercheckweg 1
69117 Heidelberg
Germany
emailchristoph.keitel@mpi-hd.mpg.de
fax+ 49 (0)6221 516-152
phone+ 49 (0)6221 516-150,
Executive Assistant: Sibel Babacan, -151

Education History

2005-presentHeidelberg University, Germany: honorary professor ("Honorarprofessor") at
the Faculty of Physics and Astronomy
2000-2005University of Freiburg, Germany: lecturer ("Privatdozent") at the faculty of
physics
1998-2000University of Freiburg, Germany: Habilitation and Venia Legendi in physics.
Topic: Atomic systems in intense laser fields.
1991-1992University of Munich, Germany: PhD in physics. Thesis topic: Lasing without
inversion and refraction without absorption. Supervision by Profs. M. O. Scully
and L. M. Narducci (official G. Süssmann)
1987-1990University of Munich, Germany: Diplom (MS) in physics. Thesis topic: Triggered
superradiance (Supervisor Prof. Dr. G. Süssmann)
1985-1987Leibniz Universität Hannover, Germany: "Vordiplom" (BS) both in physics and
mathematics
1971-1985School till Abitur (high school graduation) followed by 15 months of military
service

Employment History

2004-presentDirector, Max-Planck-Institut für Kernphysik (MPIK, Max Planck Institute for
Nuclear Physics), Heidelberg, Germany
2003-2004Lecturer of Physics ("Hochschuldozent") at the University of Freiburg (SS 03,
C2) and Heinrich Heine University Düsseldorf (WS 03/04, C4), Germany
1998-2003Project Leader ("Nachwuchsgruppenleiter") "Theory of atomic systems in
intense laser fields" at the DFG funded Special Research Area 276, Faculty
of Physics at the University of Freiburg, Germany
1997-1998Marie Curie Fellow, Institute for Theoretical Physics, University of Innsbruck,
Austria (with Prof. P. Zoller)
1992-1997Post-doctoral Research Associate, Optics Section, Blackett Laboratory,
Imperial College, London SW7 2BZ, UK (with Prof. Sir P. L. Knight FRS)
1989-1992Research Assistant (Associate since 1991), Center for Advanced Studies,
University of New Mexico, Albuquerque, NM 87131, USA (with Prof. M. O.
Scully)
summers
1990/91/92
Research Fellowship, Max-Planck-Institut für Quantenoptik (Max Planck
Institute for Quantum Optics), Garching (Munich), Germany (with Prof. M. O.
Scully and Prof. H. Walther)

Community Services

2008-presentAdvisory Board member of ELI (Extreme Light Infrastructure), in particular
ELI Beamlines (Czech Republic) and till the end of 2022 ELI Nuclear Physics
(Romania)
2006-2008Managing Director of the Max-Planck-Institut für Kernphysik (MPIK, Max
Planck Institute for Nuclear Physics) (regular 3-year term), Heidelberg,
Germany
2006-2008Member of the Regional Coordination Committee
2005-presentFounding Speaker of the International Max Planck Research School for
Quantum Dynamics in Physics, Chemistry and Biology (IMPRS-QD)
(opening of the graduate school: 2007)
1991-presentReviewer for numerous scientific publishing companies (journals & books)
and for various national and international scientific funding bodies

Awards

2023Willis E. Lamb Award for Laser Science and Quantum Optics
2008APS "Outstanding Referee" Award
2006Fellow of Optical Society of America
2003Gustav Hertz Prize of the German Physical Society
(Further information see DPG Press release/Pressemitteilungen 12.2.2003),
Physik Journal 2 (2003) Nr. 3, S. 67-68)
1998SFB Junior Research Group
1997European Union Marie Curie Fellow
1988Fellow of "Studienstiftung des Deutschen Volkes"

Publications in refereed international journals

Google Scholar
 
1.440 Nonspreading relativistic electron wavepacket in a strong laser field

A. G. Campos, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Research 6, 023040 (2024)

1.439 Atomic mass determination of uranium-238

K. Kromer, C. Lyu, J. Bieron, M. Door, L. Enzmann, P. Filianin, G. Gaigalas, Z. Harman, J. Herkenhoff, W. Huang, C. H. Keitel, S. Eliseev, and K. Blaum
Physical Review C 109, L021301 (2024)

1.438 Electron Slingshot Acceleration in Relativistic Preturbulent Shocks Explored via Emitted Photon Polarization

Z. Gong, X. Shen, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 131, 225101 (2023)
 MPIK press release: A slingshot for electrons in astrophysical plasma shocks
 MPIK-Pressemitteilung: Eine Schleuder für Elektronen in astrophysikalischen Plasma-Stoßwellen

1.437 Observation of a Low-Lying Metastable Electronic State in Highly Charged Lead by Penning-Trap Mass Spectrometry

K. Kromer, C. Lyu, M. Door, P. Filianin, Z. Harman, J. Herkenhoff, P. Indelicato, C. H. Keitel, D. Lange, Y. N. Novikov, C. Schweiger, S. Eliseev, and K. Blaum
Physical Review Letters 131, 223002 (2023)

1.436 Energy enhancement of laser-driven ions by radiation reaction and Breit–Wheeler pair production in the ultra-relativistic transparency regime

S. Bhadoria, M. Marklund, and C. H. Keitel
High power laser science and engineering 12, e7 (2023)

1.435 Stringent test of QED with hydrogen-like tin

J. Morgner, B. Tu, C. M. König., T. Sailer, F. Heiße, H. Bekker, B. Sikora, C. Lyu, V. A. Yerokhin, Z. Harman, J. R. Crespo López-Urrutia, C. H. Keitel, S. Sturm, and K. Blaum
Nature 622, 53-57 (2023)
 MPIK press release: Precise testing of quantum electrodynamics
 MPIK-Pressemitteilung: Quantenelektrodynamik auf dem Prüfstand
 MPG press release: When the laws of physics are at stake - Quantum electrodynamics put to the test
 MPG-Presssemitteilung: Wenn Gesetze der Physik auf dem Spiel stehen - Quantenelektrodynamik auf dem Prüfstand
 Nature research briefings: Testing the limits of the standard model of particle physics with a heavy, highly charged ion
 phys.org: A precise test of quantum electrodynamics: Measuring the g factor of electrons in hydrogen-like tin

1.434 Spin-polarized electron beam generation in the colliding-pulse injection scheme

Z. Gong, M. J. Quin, S. Bohlen, C. H. Keitel, K. Põder, and M. Tamburini
Matter and radiation at extremes 8, 064005 (2023)

1.433 Extreme field calculations for Penning ion traps and corresponding strong laser field scenarios

C. Lyu, B. Sikora, Z. Harman, and C. H. Keitel
Molecular Physics, e2252105 (2023)

1.432 Laser-driven lepton polarization in the quantum radiation-dominated reflection regime

K. Zhuang, Y. Chen, Y. Li, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review D 108, 033001 (2023)

1.431 Double-Slit Interference in the Ion Dynamics of Dissociative Photoionization

P. He, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 131, 013201 (2023)

1.430 Certifying Multimode Light-Matter Interaction in Lossy Resonators

D. Lentrodt, O. Diekmann, C. H. Keitel, S. Rotter, and J. Evers
Physical Review Letters 130, 263602 (2023)

1.429 Strong signature of one-loop self-energy in polarization resolved nonlinear Compton scattering

Y. Li, Y. Chen, K. Z. Hatsagortsyan, A. Di Piazza, M. Tamburini, and C. H. Keitel
Physical Review D 107, 116020 (2023)

1.428 Probing strong-field QED in beam-plasma collisions

A. Matheron, P. San Miguel Claveria, R. Ariniello, H. Ekerfelt, F. Fiuza, S. Gessner, M. F. Gilljohann, M. J. Hogan, C. H. Keitel, A. Knetsch, M. Litos, Y. Mankovska, S. Montefiori, Z. Nie, B. O'Shea, J. R. Peterson, D. Storey, Y. Wu, X. Xu, V. Zakharova, X. Davoine, L. Gremillet, M. Tamburini, and S. Corde
Communications Physics 6, 141 (2023)

1.427 All-optical ultrafast spin rotation for relativistic charged particle beams

W. Wei, F. Wan, Y. I. Salamin, J. Ren, K. Z. Hatsagortsyan, C. H. Keitel, J. Li, and Y. Zhao
Physical Review Research 5, 023030 (2023)

1.426 Relativistic analytical R-matrix theory for strong-field ionization

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 107, 023107 (2023)

1.425 Electron Polarization in Ultrarelativistic Plasma Current Filamentation Instabilities

Z. Gong, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 130, 015101 (2023)
 MPIK press release: Electron polarization for probing plasma current filamentation instability
 MPIK-Pressemitteilung: Elektronenpolarisation zur Sondierung von Instabilitäten in Plasmastrom-Filamentierung

1.424 New Measurement Resolves Key Astrophysical Fe XVII Oscillator Strength Problem

S. Kühn, C. Cheung, N. S. Oreshkina, R. Steinbrügge, M. Togawa, S. Bernitt, L. Berger, J. Buck, M. Hoesch, J. Seltmann, F. Trinter, C. H. Keitel, M. G. Kozlov, S. G. Porsev, M. F. Gu, F. S. Porter, T. Pfeifer, M. A. Leutenegger, Z. Harman, M. S. Safronova, J. R. Crespo López-Urrutia, and C. Shah
Physical Review Letters 129, 245001 (2022)
 Phys. Rev. Lett.: Editors' Suggestion - Open Access
 APS Physics Viewpoint: Getting a Clearer View of Iron Emission Lines
 idw press release: X-ray analysis without doubt - Four-decade enigma of cosmic X-rays solved
 Focus Online: Rätsel im Röntgenspektrum gelöst
 pro-physik.de: Kosmisches Röntgen-Rätsel gelöst
 MPG-Pressemitteilung: Röntgenanalyse ohne Zweifel
 MPIK press release: X-ray analysis without doubt
 MPIK-Pressemitteilung: Röntgenanalyse ohne Zweifel
 Physics Today: Experiment resolves long-standing iron-spectrum discrepancy

1.423 Testing standard-model extensions with isotope shifts in few-electron ions

V. Debierre, N. S. Oreshkina, I. A. Valuev, Z. Harman, and C. H. Keitel
Physical Review A 106, 062801 (2022)

1.422 Reconciling Conflicting Approaches for the Tunneling Time Delay in Strong Field Ionization

M. Klaiber, Q. Z. Lv, S. Sukiasyan, D. Bakucz Canário, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 129, 203201 (2022)

1.421 High-precision mass measurement of doubly magic 208Pb

K. Kromer, C. Lyu, M. Door, P. Filianin, Z. Harman, J. Herkenhoff, W. Huang, C. H. Keitel, D. Lange, Y. N. Novikov, C. Schweiger, S. Eliseev, and K. Blaum
The European Physical Journal A: Hadrons and Nuclei 58, 202 (2022)
 Erratum

1.420 Proportionality of gravitational and electromagnetic radiation by an electron in an intense plane wave

G. Audagnotto, C. H. Keitel, and A. Di Piazza
Physical Review D 106, 076009 (2022)

1.419 Reply to: On yoctosecond science

K. P. Heeg, L. Bocklage, C. Strohm, C. Ott, D. Lentrodt, J. Haber, H. Wille, R. Rüffer, J. Gollwitzer, C. F. Adolff, K. Schlage, I. Sergeev, O. Leupold, G. Meier, C. H. Keitel, R. Röhlsberger, T. Pfeifer, and J. Evers
Nature 608, E18-E19 (2022)

1.418 Generation of arbitrarily polarized GeV lepton beams via nonlinear Breit-Wheeler process

K. Xue, R. Guo, F. Wan, R. Shaisultanov, Y. Chen, Z. Xu, X. Ren, K. Z. Hatsagortsyan, C. H. Keitel, and J. Li
Fundamental Research 2, 539-545 (2022)

1.417 Tunneling ionization in ultrashort laser pulses: Edge effect and remedy

M. Klaiber, Q. Z. Lv, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 105, 063109 (2022)

1.416 Electron spin- and photon polarization-resolved probabilities of strong-field QED processes

Y. Chen, K. Z. Hatsagortsyan, C. H. Keitel, and R. Shaisultanov
Physical Review D 105, 116013 (2022)

1.415 Measurement of the bound-electron g-factor difference in coupled ions

T. Sailer, V. Debierre, Z. Harman, F. Heiße, C. König, J. Morgner, B. Tu, A. V. Volotka, C. H. Keitel, K. Blaum, and S. Sturm
Nature 606, 479-483 (2022)
 Nature News & Views: Tiny isotopic difference tests standard model of particle physics
 MPIK press release: Quantum electrodynamics tested 100 times more accurately
 MPIK-Pressemitteilung: Quantenelektrodynamik 100-fach genauerer getestet
 phys.org: Quantum electrodynamics tested 100 times more accurately than ever
 pro-physik.de: Präzisionsprüfung der Quantenelektrodynamik

1.414 Direct measurement of the 3He+ magnetic moments

A. Schneider, B. Sikora, S. Dickopf, M. Müller, N. S. Oreshkina, A. Rischka, I. A. Valuev, S. Ulmer, J. Walz, Z. Harman, C. H. Keitel, A. Mooser, and K. Blaum
Nature 606, 878-883 (2022)
 MPIK press release: How magnetic is helium-3?
 MPIK-Pressemitteilung: Wie magnetisch ist Helium-3?
 phys.org: Investigating the magnetic properties of helium-3

1.413 Evidence Against Nuclear Polarization as Source of Fine-Structure Anomalies in Muonic Atoms

I. A. Valuev, G. Colò, X. Roca-Maza, C. H. Keitel, and N. S. Oreshkina
Physical Review Letters 128, 203001 (2022)

1.412 Subcycle time-resolved nondipole dynamics in tunneling ionization

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 105, 053107 (2022)

1.411 Nondipole Time Delay and Double-Slit Interference in Tunneling Ionization

P. He, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 128, 183201 (2022)
 MPIK press release: Molecular double-slit and quantum tunnelling in intense laser light
 MPIK-Pressemitteilung: Doppelspalt und Tunneleffekt bei Molekülen im intensiven Laserlicht

1.410 Spatiotemporal dynamics of ultrarelativistic beam-plasma instabilities

P. S. M. Claveria, X. Davoine, J. R. Peterson, M. Gilljohann, I. Andriyash, R. Ariniello, C. Clarke, H. Ekerfelt, C. Emma, J. Faure, S. Gessner, M. J. Hogan, C. Joshi, C. H. Keitel, A. Knetsch, O. Kononenko, M. Litos, Y. Mankovska, K. Marsh, A. Matheron, Z. Nie, B. O'Shea, D. Storey, N. Vafaei-Najafabadi, Y. Wu, X. Xu, J. Yan, C. Zhang, M. Tamburini, F. Fiuza, L. Gremillet, and S. Corde
Physical Review Research 4, 023085 (2022)

1.409 Deciphering in situ electron dynamics of ultrarelativistic plasma via polarization pattern of emitted γ-photons

Z. Gong, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Research 4, L022024 (2022)

1.408 Helicity Transfer in Strong Laser Fields via the Electron Anomalous Magnetic Moment

Y. Li, Y. Chen, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 128, 174801 (2022)

1.407 Parametric Mössbauer radiation source

O. D. Skoromnik, I. D. Feranchuk, J. Evers, and C. H. Keitel
Physical Review Accelerators and Beams 25, 040704 (2022)

1.406 Dynamical Control of Nuclear Isomer Depletion via Electron Vortex Beams

Y. Wu, S. Gargiulo, F. Carbone, C. H. Keitel, and A. Pálffy
Physical Review Letters 128, 162501 (2022)

1.405 Nondipole Coulomb sub-barrier ionization dynamics and photon momentum sharing

P. He, M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 105, L031102 (2022)

1.404 Quasimonoenergetic Proton Acceleration via Quantum Radiative Compression

F. Wan, W. Wang, Q. Zhao, H. Zhang, T. Yu, W. Wang, W. Yan, Y. Zhao, K. Z. Hatsagortsyan, C. H. Keitel, S. V. Bulanov, and J. Li
Physical Review Applied 17, 024049 (2022)

1.403 High-Brilliance Ultranarrow-Band X Rays via Electron Radiation in Colliding Laser Pulses

Q. Z. Lv, E. Raicher, C. H. Keitel, and K. Z. Hatsagortsyan
Physical Review Letters 128, 024801 (2022)

1.402 Single particle detection system for strong-field QED experiments

F. C. Salgado, N. Cavanagh, M. Tamburini, D. W. Storey, R. Beyer, P. H. Bucksbaum, Z. Chen, A. Di Piazza, E. Gerstmayr, Harsh, E. Isele, A. R. Junghans, C. H. Keitel, S. Kuschel, C. F. Nielsen, D. A. Reis, C. Roedel, G. Sarri, A. Seidel, C. Schneider, U. I. Uggerhøj, J. Wulff, V. Yakimenko, C. Zepter, S. Meuren, and M. Zepf
New Journal of Physics 24, 015002 (2021)

1.401 Observing light-by-light scattering in vacuum with an asymmetric photon collider

M. Sangal, C. H. Keitel, and M. Tamburini
Physical Review D 104, L111101 (2021)

1.400 Photon polarization effects in polarized electron–positron pair production in a strong laser field

Y. Dai, B. Shen, J. Li, R. Shaisultanov, K. Z. Hatsagortsyan, C. H. Keitel, and Y. Chen
Matter and Radiation at Extremes 7, 014401 (2021)

1.399 Retrieving Transient Magnetic Fields of Ultrarelativistic Laser Plasma via Ejected Electron Polarization

Z. Gong, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 127, 165002 (2021)

1.398 Metastable states of Si observed in a cryogenic storage ring

D. Müll, F. Grussie, K. Blaum, S. George, J. Goeck, M. Grieser, R. von Hahn, Z. Harman, Á. Kálosi, C. H. Keitel, C. Krantz, C. Lyu, O. Novotny, F. Nüsslein, D. Paul, V. C. Schmidt, S. Singh, S. Kumar, X. Urbain, A Wolf, and H. Kreckel
Physical Review A 104, 032811 (2021)

1.397 Role of reflections in the generation of a time delay in strong-field ionization

D. Bakucz Canário, M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 104, 033103 (2021)

1.396 Two-photon-exchange corrections to the g factor of Li-like ions

V. A. Yerokhin, C. H. Keitel, and Z. Harman
Physical Review A 104, 022814 (2021)

1.395 Direct Q-Value Determination of the β Decay of 187Re

P. E. Filianin, C. Lyu, M. Door, K. Blaum, W. J. Huang, M. Haverkort, P. Indelicato, C. H. Keitel, K. Kromer, D. Lange, Y. N. Novikov, A. Rischka, R. X. Schüssler, C. Schweiger, S. Sturm, S. Ulmer, Z. Harman, and S. Eliseev
Physical Review Letters 127, 072502 (2021)
 MPIK press release: Important measuring method of neutrino physics on the test bench
 MPIK-Pressemitteilung: Wichtige Messmethode der Neutrinophysik auf dem Prüfstand
 idw press release: Important measuring method of neutrino physics on the test bench

1.394 Transmutation of protons in a strong electromagnetic field

T. N. Wistisen, C. H. Keitel, and A. Di Piazza
New Journal of Physics 23, 065007 (2021)

1.393 Ultrarelativistic electrons in counterpropagating laser beams

Q. Z. Lv, E. Raicher, C. H. Keitel, and K. Z. Hatsagortsyan
New Journal of Physics 23, 065005 (2021)

1.392 Relativistic effective charge model of a multi-electron atom

K. Dzikowski, O. D. Skoromnik, I. D. Feranchuk, N. S. Oreshkina, and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 54, 115002 (2021)

1.391 Construction of Dirac spinors for electron vortex beams in background electromagnetic fields

A. G. Campos, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Research 3, 013245 (2021)

1.390 Two-loop virtual light-by-light scattering corrections to the bound-electron g factor

V. Debierre, B. Sikora, H. Cakir, N. S. Oreshkina, V. A. Yerokhin, C. H. Keitel, and Z. Harman
Physical Review A 103, L030802 (2021)

1.389 Anomalous violation of the local constant field approximation in colliding laser beams

Q. Z. Lv, E. Raicher, C. H. Keitel, and K. Z. Hatsagortsyan
Physical Review Research 3, 013214 (2021)

1.388 Coherent X-ray−optical control of nuclear excitons

K. P. Heeg, A. Kaldun, C. Strohm, C. Ott, R. Subramanian, D. Lentrodt, J. Haber, H. Wille, S. Goerttler, R. Rüffer, C. H. Keitel, R. Röhlsberger, T. Pfeifer, and J. Evers
Nature 590, 401-404 (2021)
 MPIK press release: X-ray double flashes control atomic nuclei
 MPIK-Pressemitteilung: Röntgen-Doppelblitze treiben Atomkerne an
 MPG press release: Atomic nuclei in the quantum swing
 Press release of the European Synchrotron Radiation Facility (ESRF): X-ray double flashes control atomic nuclei
 MPIK press release: MPIK twice among the finalists for “Breakthrough of the Year 2021“
 MPIK-Pressemitteilung: MPIK gleich doppelt unter den 10 Finalisten für „Breakthrough of the Year 2021“

1.387 Extremely Dense Gamma-Ray Pulses in Electron Beam-Multifoil Collisions

A. Sampath, X. Davoine, S. Corde, L. Gremillet, M. Gilljohann, M. Sangal, C. H. Keitel, R. Ariniello, J. Cary, H. Ekerfelt, C. Emma, F. Fiuza, H. Fujii, M. Hogan, C. Joshi, A. Knetsch, O. Kononenko, V. Lee, M. Litos, K. Marsh, Z. Nie, B. O'Shea, J. R. Peterson, P. S. M. Claveria, D. Storey, Y. Wu, X. Xu, C. Zhang, and M. Tamburini
Physical Review Letters 126, 064801 (2021)
 MPIK press release: How to make a gamma-ray pulse with the density of a solid
 MPIK-Pressemitteilung: Wie man einen Gammastrahlenpuls mit der Dichte eines Festkörpers erzeugen kann

1.386 A Cosmic Zevatron Based on Cyclotron Auto-resonance

Y. I. Salamin, M. Wen, and C. H. Keitel
The Astrophysical Journal 907, 24 (2021)

1.385 Sub-barrier pathways to Freeman resonances

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 102, 053105 (2020)

1.384 High-energy γ-photon polarization in nonlinear Breit-Wheeler pair production and γ polarimetry

F. Wan, Y. Wang, R. Guo, Y. Chen, R. Shaisultanov, Z. Xu, K. Z. Hatsagortsyan, C. H. Keitel, and J. Li
Physical Review Research 2, 032049(R) (2020)

1.383 Self-energy screening effects in the g factor of Li-like ions

V. A. Yerokhin, K. Pachucki, M. Puchalski, C. H. Keitel, and Z. Harman
Physical Review A 102, 022815 (2020)

1.382 Interrogating the Temporal Coherence of EUV Frequency Combs with Highly Charged Ions

C. Lyu, S. M. Cavaletto, C. H. Keitel, and Z. Harman
Physical Review Letters 125, 093201 (2020)

1.381 Spontaneous decay processes in a classical strong low-frequency laser field

M. Macovei, J. Evers, and C. H. Keitel
Physical Review A 102, 013718 (2020)

1.380 Ab initio quantum models for thin-film x-ray cavity QED

D. Lentrodt, K. P. Heeg, C. H. Keitel, and J. Evers
Physical Review Research 2, 023396 (2020)

1.379 QED corrections to the g factor of Li- and B-like ions

H. Cakir, V. A. Yerokhin, N. S. Oreshkina, B. Sikora, I. I. Tupitsyn, C. H. Keitel, and Z. Harman
Physical Review A 101, 062513 (2020)

1.378 Narrow-band hard-x-ray lasing with highly charged ions

C. Lyu, S. M. Cavaletto, C. H. Keitel, and Z. Harman
Scientific Reports 10, 9439 (2020)

1.377 Structural trends in atomic nuclei from laser spectroscopy of tin

D. T. Yordanov, L. V. Rodríguez, D. L. Balabanski, J. Bieroń, M. L. Bissell, K. Blaum, B. Cheal, J. Ekman, G. Gaigalas, R. F. G. Ruiz, G. Georgiev, W. Gins, M. R. Godefroid, C. Gorges, Z. Harman, H. Heylen, P. Jönsson, A. Kanellakopoulos, S. Kaufmann, C. H. Keitel, V. Lagaki, S. Lechner, B. Maaß, S. Malbrunot-Ettenauer, W. Nazarewicz, R. Neugart, G. Neyens, W. Nörtershäuser, N. S. Oreshkina, A. Papoulia, P. Pyykkö, P. Reinhard, S. Sailer, R. Sánchez, S. Schiffmann, S. Schmidt, L. Wehner, C. Wraith, L. Xie, Z. Xu, and X. Yang
Communications Physics 3, 107 (2020)

1.376 High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem

S. Kühn, C. Shah, J. R. Crespo López-Urrutia, K. Fujii, R. Steinbrügge, J. Stierhof, M. Togawa, Z. Harman, N. S. Oreshkina, C. Cheung, M. G. Kozlov, S. G. Porsev, M. S. Safronova, J. C. Berengut, M. Rosner, M. Bissinger, R. Ballhausen, N. Hell, S. Park, M. Chung, M. Hoesch, J. Seltmann, A. S. Surzhykov, V. A. Yerokhin, J. Wilms, F. S. Porter, T. Stöhlker, C. H. Keitel, T. Pfeifer, G. V. Brown, M. A. Leutenegger, and S. Bernitt
Physical Review Letters 124, 225001 (2020)

1.375 Skyrme-type nuclear interaction as a tool for calculating the finite-nuclear-size correction to atomic energy levels and the bound-electron g factor

I. Valuev, Z. Harman, C. H. Keitel, and N. S. Oreshkina
Physical Review A 101, 062502 (2020)

1.374 Fifth-force search with the bound-electron g factor

V. Debierre, C. H. Keitel, and Z. Harman
Physics Letters B 807, 135527 (2020)

1.373 Measurement of the quadrupole moment of 185Re and 187Re from the hyperfine structure of muonic X rays

A. Antognini, N. Berger, T. E. Cocolios, R. Dressler, R. Eichler, A. Eggenberger, P. Indelicato, K. Jungmann, C. H. Keitel, K. Kirch, A. Knecht, N. Michel, J. Nuber, N. S. Oreshkina, A. Ouf, A. Papa, R. Pohl, M. Pospelov, E. Rapisarda, N. Ritjoho, S. Roccia, N. Severijns, A. Skawran, S. M. Vogiatzi, F. Wauters, and L. Willmann
Physical Review C 101, 054313 (2020)

1.372 Detection of metastable electronic states by Penning trap mass spectrometry

R. X. Schüssler, H. Bekker, M. Braß, H. Cakir, J. R. Crespo López Urrutia, M. Door, P. E. Filianin, Z. Harman, M. W. Haverkort, W. J. Huang, P. Indelicato, C. H. Keitel, C. M. König., K. Kromer, M. Müller, Y. N. Novikov, A. Rischka, C. Schweiger, S. Sturm, S. Ulmer, S. Eliseev, and K. Blaum
Nature 581, 42-46 (2020)
 Nature News & Views: Mass spectrometry for future atomic clocks
 MPIK press release: Quantum jump tipping the balance
 MPIK-Pressemitteilung: Quantensprung auf der Waage
 MPG press release: Quantum jump tipping the balance
 MPG-Pressemitteilung: Quantensprung auf der Waage
 idw press release: Quantum jump tipping the balance
 phys.org: Successfully measuring infinitesimal change in mass of individual atoms for the first time
 Focus Online: Quantensprung auf der Waage
 wissenschaft.de: Quantensprung auf der Waage
 Physik in unserer Zeit: Quantensprung auf der Waage
 Frankfurter Allgemeine Zeitung: Wie viel wiegt ein Quantensprung?

1.371 Comment on "Table-Top Laser-Based Source of Femtosecond, Collimated, Ultrarelativistic Positron Beams" Reply

G. Sarri, W. Schumaker, A. Di Piazza, M. Vargas, B. Dromey, M. E. Dieckmann, V. Chvykov, A. Maksimchuk, V. Yanovsky, Z. H. He, B. X. Hou, J. A. Nees, A. G. R. Thomas, C. H. Keitel, M. Zepf, and K. Krushelnick
Physical Review Letters 124, 179502 (2020)

1.370 Self-energy-corrected Dirac wave functions for advanced QED calculations in highly charged ions

N. S. Oreshkina, H. Cakir, B. Sikora, V. A. Yerokhin, V. Debierre, Z. Harman, and C. H. Keitel
Physical Review A 101, 032511 (2020)

1.369 Mass-Difference Measurements on Heavy Nuclides with an eV/c2 Accuracy in the PENTATRAP Spectrometer

A. Rischka, H. Cakir, M. Door, P. Filianin, Z. Harman, W. J. Huang, P. Indelicato, C. H. Keitel, C. M. König, K. Kromer, M. Müller, Y. N. Novikov, R. X. Schüssler, C. Schweiger, S. Eliseev, and K. Blaum
Physical Review Letters 124, 113001 (2020)

1.368 Electron Acceleration in Direct Laser-Solid Interactions Far Beyond the Ponderomotive Limit

M. Wen, Y. I. Salamin, and C. H. Keitel
Physical Review Applied 13, 034001 (2020)

1.367 Polarized Ultrashort Brilliant Multi-GeV γ Rays via Single-Shot Laser-Electron Interaction

Y. Li, R. Shaisultanov, Y. Chen, F. Wan, K. Z. Hatsagortsyan, C. H. Keitel, and J. Li
Physical Review Letters 124, 014801 (2020)

1.366 Theory of the two-loop self-energy correction to the g factor in nonperturbative Coulomb fields

B. Sikora, V. A. Yerokhin, N. S. Oreshkina, H. Cakir, C. H. Keitel, and Z. Harman
Physical Review Research 2, 012002(R) (2020)

1.365 X-ray-assisted nuclear excitation by electron capture in optical laser-generated plasmas

Y. Wu, C. H. Keitel, and A. Pálffy
Physical Review A 100, 063420 (2019)

1.364 Detection of the 5p-4f orbital crossing and its optical clock transition in Pr9+

H. Bekker, A. Borschevsky, Z. Harman, C. H. Keitel, T. Pfeifer, P. O. Schmidt, J. R. Crespo López Urrutia, and J. C. Berengut
Nature Communications 10, 5651 (2019)
 MPIK-Pressemitteilung: Hochgeladenes Ion bahnt den Weg zu neuer Physik

1.363 Ultrarelativistic polarized positron jets via collision of electron and ultraintense laser beams

F. Wan, R. Shaisultanov, Y. Li, K. Z. Hatsagortsyan, C. H. Keitel, and J. Li
Physics Letters B 800, 135120 (2019)

1.362 Polarized Positron Beams via Intense Two-Color Laser Pulses

Y. Chen, P. He, R. Shaisultanov, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 123, 174801 (2019)
 MPIK-Pressemitteilung: Laserblitze für polarisierte Elektronen- und Positronenstrahlen
 pro-physik.de: Polarisationstransfer via Laserpuls
 physik.cosmos-indirekt.de: Laserblitze für polarisierte Elektronen- und Positronenstrahlen
 chemie.de: Laserblitze für polarisierte Elektronen- und Positronenstrahlen

1.361 Roadmap on STIRAP applications

K. Bergmann, H. Nägerl, C. Panda, G. Gabrielse, E. Miloglyadov, M. Quack, G. Seyfang, G. Wichmann, S. Ospelkaus, A. Kuhn, S. Longhi, A. Szameit, P. Pirro, B. Hillebrands, X. Zhu, J. Zhu, M. Drewsen, W. K. Hensinger, S. Weidt, T. Halfmann, H. Wang, G. S. Paraoanu, N. V. Vitanov, J. Mompart, T. Busch, T. J. Barnum, D. D. Grimes, R. W. Field, M. G. Raizen, E. Narevicius, M. Auzinsh, D. Budker, A. Pálffy, and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 52, 202001 (2019)

1.360 Holographic interferences in strong-field ionization beyond the dipole approximation: The influence of the peak and focal-volume-averaged laser intensities

B. Willenberg, J. Maurer, U. Keller, J. Daněk, M. Klaiber, N. Teeny, K.Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 100, 033417 (2019)

1.359 g Factor of Boronlike Argon 40Ar13+

I. Arapoglou, A. Egl, M. Höcker, T. Sailer, B. Tu, A. Weigel, R. Wolf, H. Cakir, V. A. Yerokhin, N. S. Oreshkina, V. A. Agababaev, A. V. Volotka, D. V. Zinenko, D. A. Glazov, Z. Harman, C. H. Keitel, S. Sturm, and K. Blaum
Physical Review Letters 122, 253001 (2019)
 pro-physik.de: Alphatrap-Experiment liefert erste Ergebnisse
 idw press release: First results of the new Alphatrap experiment
 MPIK-Pressemitteilung: Erste Resultate des neuen ALPHATRAP-Experiments

1.358 93mMo Isomer Depletion via Beam-Based Nuclear Excitation by Electron Capture

Y. Wu, C. H. Keitel, and A. Pálffy
Physical Review Letters 122, 212501 (2019)

1.357 Polarized Laser-WakeField-Accelerated Kiloampere Electron Beams

M. Wen, M. Tamburini, and C. H. Keitel
Physical Review Letters 122, 214801 (2019)
 MPIK-Pressemitteilung: Laserblitze für polarisierte Elektronen- und Positronenstrahlen
 pro-physik.de: Polarisationstransfer via Laserpuls
 physik.cosmos-indirekt.de: Laserblitze für polarisierte Elektronen- und Positronenstrahlen
 chemie.de: Laserblitze für polarisierte Elektronen- und Positronenstrahlen

1.356 Semiclassical limitations for photon emission in strong external fields

E. Raicher, S. Eliezer, C. H. Keitel, and K. Z. Hatsagortsyan
Physical Review A 99, 052513 (2019)

1.355 Polarized Light from the Transportation of a Matter-Antimatter Beam in a Plasma

U. Sinha, C. H. Keitel, and N. Kumar
Physical Review Letters 122, 204801 (2019)

1.354 Ultrarelativistic Electron-Beam Polarization in Single-Shot Interaction with an Ultraintense Laser Pulse

Y. Li, R. Shaisultanov, K. Z. Hatsagortsyan, F. Wan, C. H. Keitel, and J. Li
Physical Review Letters 122, 154801 (2019)
 MPIK-Pressemitteilung: Laserblitze für polarisierte Elektronen- und Positronenstrahlen
 pro-physik.de: Polarisationstransfer via Laserpuls
 physik.cosmos-indirekt.de: Laserblitze für polarisierte Elektronen- und Positronenstrahlen
 chemie.de: Laserblitze für polarisierte Elektronen- und Positronenstrahlen

1.353 Nonlinear Compton scattering of an ultraintense laser pulse in a plasma

F. Mackenroth, N. Kumar, N. Neitz, and C. H. Keitel
Physical Review E 99, 033205 (2019)

1.352 Generation of twisted γ-ray radiation by nonlinear Thomson scattering of twisted light

Y. Chen, K. Z. Hatsagortsyan, and C. H. Keitel
Matter and Radiation at Extremes 4, 024401 (2019)

1.351 Improved local-constant-field approximation for strong-field QED codes

A. Di Piazza, M. Tamburini, S. Meuren, and C. H. Keitel
Physical Review A 99, 022125 (2019)

1.350 Role of high ponderomotive energy in laser-induced nonsequential double ionization

T. Shaaran, N. Camus, J. Dura, L. Fechner, A. Thai, A. Britz, M. Baudisch, T. Steinle, A. Senftleben, C. D. Schröter, J. Ullrich, T. Pfeifer, C. H. Keitel, J. Biegert, K. Z. Hatsagortsyan, and R. Moshammer
Physical Review A 99, 023421 (2019)

1.349 Determining the carrier-envelope phase of relativistic laser pulses via electron-momentum distribution

Y. Li, J. Li, K. Z. Hatsagortsyan, Y. Zhao, B. Zhang, Y. Li, Y. Liu, Z. Zhang, Z. Xu, and C. H. Keitel
Physical Review A 99, 013850 (2019)

1.348 Resonance strengths for KLL dielectronic recombination of highly charged mercury ions and improved empirical Z-scaling law

Z. Harman, C. Shah, A. J. González Martínez, U. D. Jentschura, H. Tawara, C. H. Keitel, J. H. Ullrich, and J. R. Crespo López-Urrutia
Physical Review A 99, 012506 (2019)

1.347 Nonperturbative analysis of nuclear shape effects on the bound electron g factor

N. Michel, J. Zatorski, N. S. Oreshkina, and C. H. Keitel
Physical Review A 99, 012505 (2019)

1.346 Electron acceleration by a radially-polarized laser pulse in a plasma micro-channel

M. Wen, Y. I. Salamin, and C. H. Keitel
Optics Express 27, 557-566 (2019)

1.345 High-energy direct photoelectron spectroscopy in strong-field ionization

P. He, M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 98, 053428 (2018)

1.344 Electron-angular-distribution reshaping in the quantum radiation-dominated regime

Y. Li, Y. Zhao, K. Z. Hatsagortsyan, C. H. Keitel, and J. Li
Physical Review A 98, 052120 (2018)

1.343 Real-Time Reconstruction of the Strong-Field-Driven Dipole Response

V. Stooß, S. M. Cavaletto, S. Donsa, A. Blättermann, P. Birk, C. H. Keitel, I. Brezinová, J. Burgdörfer, C. Ott, and T. Pfeifer
Physical Review Letters 121, 173005 (2018)

1.342 γ-Ray Beams with Large Orbital Angular Momentum via Nonlinear Compton Scattering with Radiation Reaction

Y. Chen, J. Li, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 121, 074801 (2018)

1.341 Coulomb effect in laser-induced recollision excitation

T. Shaaran, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 98, 023410 (2018)

1.340 Implementing nonlinear Compton scattering beyond the local-constant-field approximation

A. Di Piazza, M. Tamburini, S. Meuren, and C. H. Keitel
Physical Review A 98, 012134 (2018)

1.339 Experimental Signatures of the Quantum Nature of Radiation Reaction in the Field of an Ultraintense Laser

K. Poder, M. Tamburini, G. Sarri, A. Di Piazza, S. Kuschel, C. D. Baird, K. Behm, S. Bohlen, J. M. Cole, D. J. Corvan, M. Duff, E. Gerstmayr, C. H. Keitel, K. Krushelnick, S. P. D. Mangles, P. McKenna, C. D. Murphy, Z. Najmudin, C. P. Ridgers, G. M. Samarin, D. R. Symes, A. G. R. Thomas, J. Warwick, and M. Zepf
Physical Review X 8, 031004 (2018)
 MPIK-Pressemitteilung: Intensives Licht verlangsamt hochenergetische Elektronen

1.338 Nuclear excitation by electron capture in optical-laser-generated plasmas

J. Gunst, Y. Wu, C. H. Keitel, and A. Pálffy
Physical Review E 97, 063205 (2018)

1.337 Analytical approach to Coulomb focusing in strong-field ionization. II. Multiple recollisions

J. Daněk, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 97, 063410 (2018)

1.336 Analytical approach to Coulomb focusing in strong-field ionization. I. Nondipole effects

J. Daněk, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 97, 063409 (2018)

1.335 Interplay between Coulomb-focusing and non-dipole effects in strong-field ionization with elliptical polarization

J. Daněk, M. Klaiber, K. Z. Hatsagortsyan, C. H. Keitel, B. Willenberg, J. Mauer, B. W. Mayer, C. R. Phillips, L. Gallmann, and U. Keller
Journal of Physics B: Atomic, Molecular and Optical Physics 51, 114001 (2018)

1.334 Giant collimated gamma-ray flashes

A. Benedetti, M. Tamburini, and C. H. Keitel
Nature Photonics 12, 319-323 (2018)
 Nature News & Views: Instability yields bright gamma emission
 MPIK-Pressemitteilung: Gammastrahlungsblitze aus Plasmafäden
 idw-Pressemitteilung: Gammastrahlungsblitze aus Plasmafäden
 physik.cosmos-indirekt.de: Gammastrahlungsblitze aus Plasmafäden

1.333 Single-Shot Carrier-Envelope Phase Determination of Long Superintense Laser Pulses

J. Li, Y. Chen, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 120, 124803 (2018)

1.332 Tailoring Laser-Generated Plasmas for Efficient Nuclear Excitation by Electron Capture

Y. Wu, J. Gunst, C. H. Keitel, and A. Pálffy
Physical Review Letters 120, 052504 (2018)

1.331 Probing the ionization wave packet and recollision dynamics with an elliptically polarized strong laser field in the nondipole regime

J. Mauer, B. Willenberg, J. Daněk, B. W. Mayer, C. R. Phillips, L. Gallmann, M. Klaiber, K. Z. Hatsagortsyan, C. H. Keitel, and U. Keller
Physical Review A 97, 013404 (2018)

1.330 Under-the-Tunneling-Barrier Recollisions in Strong-Field Ionization

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 120, 013201 (2018)

1.329 Improving the accuracy of the muon mass and magnetic moment anomaly via the bound-muon g factor

B. Sikora, H. Cakir, N. Michel, V. Debierre, N. S. Oreshkina, N. Belov, V. A. Yerokhin, C. H. Keitel, and Z. Harman
Physical Review D 97, 111301(R) (2018)

1.328 High-Energy Vacuum Birefringence and Dichroism in an Ultrastrong Laser Field

S. Bragin, S. Meuren, C. H. Keitel, and A. Di Piazza
Physical Review Letters 119, 250403 (2017)

1.327 Analytic model of a multi-electron atom

O. Skoromnik, I. D. Feranchuk, A. U. Leonau, and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 50, 245007 (2017)

1.326 Theoretical prediction of the fine and hyperfine structure of heavy muonic atoms

N. Michel, N. S. Oreshkina, and C. H. Keitel
Physical Review A 96, 032510 (2017)

1.325 Hyperfine splitting in simple ions for the search of the variation of fundamental constants

N. S. Oreshkina, S. M. Cavaletto, N. Michel, Z. Harman, and C. H. Keitel
Physical Review A 96, 030501(R) (2017)

1.324 Spectral narrowing of x-ray pulses for precision spectroscopy with nuclear resonances

K. P. Heeg, A. Kaldun, C. Strohm, P. Reiser, C. R. Ott, R. Subramanian, D. Lentrodt, J. Haber, H.-C. Wille, S. Goerttler, R. Rüffer, C. H. Keitel, R. Röhlsberger, T. Pfeifer, and J. Evers
Science 357, 375-378 (2017)
 MPG-Pressemitteilung: Scharfe Röntgenblitze aus dem Atomkern
 MPIK-Pressemitteilung: Ruckartige Bewegung schärft Röntgenpulse
 SOLARIFY: Ruckartige Bewegung schärft Röntgenpulse
 Innovations-Report: Ruckartige Bewegung schärft Röntgenpulse
 physik.cosmos-indirekt.de: Ruckartige Bewegung schärft Röntgenpulse

1.323 Laser-pulse-shape control of seeded QED cascades

M. Tamburini, A. Di Piazza, and C. H. Keitel
Scientific Reports 7, 5694 (2017)

1.322 Experimental Evidence for Quantum Tunneling Time

N. Camus, E. Yakaboylu, L. Fechner, M. Klaiber, M. Laux, Y. Mi, K. Z. Hatsagortsyan, T. Pfeifer, C. H. Keitel, and R. Moshammer
Physical Review Letters 119, 023201 (2017)
 MPG-Pressemitteilung: Zeitmessung im Quantentunnel
 MPIK-Pressemitteilung: Quantenmechanisches Tunneln braucht Zeit
 Spektrum.de: Wie lange dauert der Tunneleffekt?

1.321 Extraction of the electron mass from g-factor measurements on light hydrogenlike ions.

J. Zatorski, B. Sikora, S. G. Karshenboim, S. Sturm, F. Köhler, K. Blaum, C. H. Keitel, and Z. Harman
Physical Review A 96, 012502 (2017)

1.320 Plasma high-order-harmonic generation from ultraintense laser pulses

S. Tang, N. Kumar, and C. H. Keitel
Physical Review E 95, 051201(R) (2017)

1.319 Deterministic strong-field quantum control

S. M. Cavaletto, Z. Harman, T. Pfeifer, and C. H. Keitel
Physical Review A 95, 043413 (2017)

1.318 Spin-one-half particles in strong electromagnetic fields: Spin effects and radiation reaction

M. Wen, C. H. Keitel, and H. Bauke
Physical Review A 95, 042102 (2017)

1.317 Strong-field ionization via a high-order Coulomb-corrected strong-field approximation

M. Klaiber, J. Daněk, E. Yakaboylu, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 95, 023403 (2017)

1.316 Journeys from quantum optics to quantum technology

S. M. Barnett, A. Beige, A. Ekert, B. M. Garraway, C. H. Keitel, V. Kendon, M. Lein, G. J. Milburn, H. M. Moya-Cessa, M. Murao, J. K. Pachos, G. M. Palma, E. Paspalakis, S. J. D. Phoenix, B. Piraux, M. B. Plenio, B. C. Sanders, J. Twamley, A. Vidiella-Barranco, and M. S. Kim
Progress in Quantum Electronics 54, 19-45 (2017)

1.315 X-ray-generated heralded macroscopical quantum entanglement of two nuclear ensembles

W. Liao, C. H. Keitel, and A. Pálffy
Scientific Reports 6, 33361 (2016)

1.314 Identifying the Stern-Gerlach force of classical electron dynamics

M. Wen, H. Bauke, and C. H. Keitel
Scientific Reports 6, 31624 (2016)

1.313 Virtual-detector approach to tunnel ionization and tunneling times

N. Teeny, C. H. Keitel, and H. Bauke
Physical Review A 94, 022104 (2016)

1.312 Weighted difference of g factors of light Li-like and H-like ions for an improved determination of the fine-structure constant

V. A. Yerokhin, E. Berseneva, Z. Harman, I. I. Tupitsyn, and C. H. Keitel
Physical Review A 94, 022502 (2016)

1.311 Multi-pair states in electron-positron pair creation

A. Wöllert, H. Bauke, and C. H. Keitel
Physics Letters B 760, 552-557 (2016)

1.310 Logical operations with single x-ray photons via dynamically-controlled nuclear resonances

J. Gunst, C. H. Keitel, and A. Pálffy
Scientific Reports 6, 25136 (2016)

1.309 Semiclassical picture for electron-positron photoproduction in strong laser fields

S. Meuren, C. H. Keitel, and A. Di Piazza
Physical Review D 93, 085028 (2016)

1.308 X-ray fluorescence spectrum of highly charged Fe ions driven by strong free-electron-laser fields

N. S. Oreshkina, S. M. Cavaletto, C. H. Keitel, and Z. Harman
Journal of Physics B: Atomic, Molecular and Optical Physics 49, 094003 (2016)

1.307 Tailoring superradiance to design artificial quantum systems

P. Longo, C. H. Keitel, and J. Evers
Scientific Reports 6, 23628 (2016)

1.306 g Factor of Light Ions for an Improved Determination of the Fine-Structure Constant

V. A. Yerokhin, E. Berseneva, Z. Harman, I. I. Tupitsyn, and C. H. Keitel
Physical Review Letters 116, 100801 (2016)
 MPIK-Presseinformation: Neuer Weg zur Feinstrukturkonstante
 pro-physik.de: Neuer Weg zur Feinstrukturkonstante

1.305 Fields of an ultrashort tightly focused laser pulse

J. Li, Y. Salamin, K. Z. Hatsagortsyan, and C. H. Keitel
Journal of the Optical Society of America B-Optical Physics 33, 405-411 (2016)

1.304 Ionization Time and Exit Momentum in Strong-Field Tunnel Ionization

N. Teeny, E. Yakaboylu, H. Bauke, and C. H. Keitel
Physical Review Letters 116, 063003 (2016)

1.303 Bosonic pair creation and the Schiff-Snyder-Weinberg effect

Q. Z. Lv, H. Bauke, Q. Su, C. H. Keitel, and R. Grobe
Physical Review A 93, 012119 (2016)

1.302 High Field Physics and QED Experiments at ELI-NP

I.C.E. Turcu, F. Negoita, D.A. Jaroszynski, P. McKenna, S. Balascuta, D. Ursescu, I. Dancus, M.O. Cernaianu, M.V. Tataru, P. Ghenuche, D. Stutman, A. Boianu, M. Risca, M. Toma, C. Petcu, G. Acbas, S.R. Yoffe, A. Noble, B. Ersfeld, E. Brunetti, R. Capdessus, C. Murphy, C.P. Ridgers, D. Neely, S.P.D. Mangles, R. J. Gray, A.G.R. Thomas, J. G Kirk, A. Ilderton, M. Marklund, D.F. Gordon, B. Hafizi, D. Kaganovich, J.P. Palastro, E. D’Humieres, M. Zepf, G. Sarri, H. Gies, F. Karbstein, J. Schreiber, G.G. Paulus, B. Dromey, C. Harvey, A. Di Piazza, C. H. Keitel, M.C. Kaluza, S. Gales, and N.V. Zamfir
Romanian Reports in Physics 68, S145-S231 (2016)

1.301 Regularization of ultraviolet divergence for a particle interacting with a scalar quantum field

O. Skoromnik, I. D. Feranchuk, D. V. Lu, and C. H. Keitel
Physical Review D 92, 125019 (2015)

1.300 Direct and secondary nuclear excitation with x-ray free-electron lasers

J. Gunst, Y. Wu, N. Kumar, C. H. Keitel, and A. Pálffy
Physics of Plasmas 22, 112706 (2015)

1.299 Attosecond Gamma-Ray Pulses via Nonlinear Compton Scattering in the Radiation-Dominated Regime

J. Li, K. Z. Hatsagortsyan, B. J. Galow, and C. H. Keitel
Physical Review Letters 115, 204801 (2015)

1.298 Influence of ion movement in a particle trap on the bound electron g factor

N. Michel, J. Zatorski, and C. H. Keitel
Physical Review A 92, 052509 (2015)

1.297 Overview of laser-driven generation of electron-positron beams

G. Sarri, M. E. Dieckmann, I. Kourakis, A. Di Piazza, B. Reville, C. H. Keitel, and M. Zepf
Journal of Plasma Physics 81, 455810401 (2015)

1.296 Population inversion in two-level systems possessing permanent dipoles

M. Macovei, M. Mishra, and C. H. Keitel
Physical Review A 92, 013846 (2015)

1.295 Phase reconstruction of strong-field excited systems by transient-absorption spectroscopy

Z. Liu, S. M. Cavaletto, C. Ott, K. Meyer, Y. Mi, Z. Harman, C. H. Keitel, and T. Pfeifer
Physical Review Letters 115, 033003 (2015)

1.294 Feasibility of electron cyclotron autoresonance acceleration by a short terahertz pulse

Y. I. Salamin, J. Li, B. J. Galow, and C. H. Keitel
Optics Express 23, 17560-17567 (2015)

1.293 Spin polarized electron-positron pair production via elliptical polarized laser fields

A. Wöllert, H. Bauke, and C. H. Keitel
Physical Review D 91, 125026 (2015)

1.292 Nonlinear neutrino-photon interactions inside strong laser pulses

S. Meuren, C. H. Keitel, and A. Di Piazza
Journal of High Energy Physics, 127 (2015)

1.291 Identifications of 5s1/2−5p3/2 and 5s2−5s5p EUV transitions of promethium-like Pt, Ir, Os and Re

H. Bekker, O. O. Versolato, A. Windberger, N. S. Oreshkina, R. Schupp, T. M. Baumann, Z. Harman, C. H. Keitel, P. O. Schmidt, J. Ullrich, and J. Crespo Lopez-Urrutia
Journal of Physics B 48, 144018 (2015)

1.290 Generation of neutral and high-density electron–positron pair plasmas in the laboratory

G. Sarri, K. Poder, J. M. Cole, W. Schumaker, A. Di Piazza, B. Reville, T. Dzelzainis, D. Doria, L. A. Gizzi, G. Grittani, S. Kar, C. H. Keitel, K. Krushelnick, S. Kuschel, S. P. D. Mangles, Z. Najmudin, N. Shukla, L. O. Silva, D. Symes, A. G. R. Thomas, M. Vargas, J. Vieira, and M. Zepf
Nature Communications 6, 6747 (2015)
 MPIK-Pressemitteilung: Ein Plasma aus Materie und Antimaterie
 idw press release: A matter-antimatter plasma
 The Conversation: How we recreated the early universe in the laboratory
 CERN Courier: Laser set-up generates electron–positron plasma in the lab

1.289 Identification of the Predicted 5s−4f Level Crossing Optical Lines with Applications to Metrology and Searches for the Variation of Fundamental Constants

A. Windberger, J. R. Crespo López-Urrutia, H. Bekker, N. S. Oreshkina, J. C. Berengut, V. Bock, A. Borschevsky, V. A. Dzuba, E. Eliav, Z. Harman, U. Kaldor, S. Kaul, U. I. Safronova, V. V. Flambaum, C. H. Keitel, P. O. Schmidt, J. Ullrich, and O. O. Versolato
Physical Review Letters 114, 150801 (2015)

1.288 High-Energy Recollision Processes of Laser-Generated Electron-Positron Pairs

S. Meuren, K. Z. Hatsagortsyan, C. H. Keitel, and A. Di Piazza
Physical Review Letters 114, 143201 (2015)

1.287 Relativistic tunneling picture of electron-positron pair creation

A. Wöllert, M. Klaiber, H. Bauke, and C. H. Keitel
Physical Review D 91, 065022 (2015)

1.286 Tunneling Dynamics in Multiphoton Ionization and Attoclock Calibration

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 114, 083001 (2015)

1.285 Ion Acceleration by Short Chirped Laser Pulses

J. Li, B. J. Galow, C. H. Keitel, and Z. Harman
Applied Sciences 5, 36-47 (2015)

1.284 Polarization-operator approach to pair creation in short laser pulses

S. Meuren, K. Z. Hatsagortsyan, C. H. Keitel, and A. Di Piazza
Physical Review D 91, 013009 (2015)

1.283 Ultrahigh Brilliance Multi-MeV γ-Ray Beams from Nonlinear Relativistic Thomson Scattering

G. Sarri, D. J. Corvan, W. Schumaker, J. Cole, A. Di Piazza, H. Ahmed, C. Harvey, C. H. Keitel, K. Krushelnick, S. P. D. Mangles, Z. Najmudin, D. Symes, A. G. R. Thomas, M. Yeung, Z. Zhao, and M. Zepf
Physical Review Letters 113, 224801 (2014)

1.282 Particle production reactions in laser-boosted lepton collisions

S. Müller, C. H. Keitel, and C. Müller
Physical Review D 90, 094008 (2014)

1.281 Quantum dynamics of a two-level emitter with modulated transition frequency

M. Macovei and C. H. Keitel
Physical Review A 90, 043838 (2014)

1.280 Electron-spin dynamics induced by photon spins

S. Ahrens, H. Bauke, C. H. Keitel, and R. Grobe
New Journal of Physics 16, 103028 (2014)

1.279 Astrophysical line diagnosis requires non-linear dynamical atomic modeling

N. S. Oreshkina, S. M. Cavaletto, C. H. Keitel, and Z. Harman
Physical Review Letters 113, 143001 (2014)
 Phys. Rev. Lett.: Editors’ suggestion

1.278 All-Electromagnetic Control of Broadband Quantum Excitations Using Gradient Photon Echoes

W. Liao, C. H. Keitel, and A. Pálffy
Physical Review Letters 113, 123602 (2014)

1.277 Generation of high-frequency combs locked to atomic resonances by quantum phase modulation

Z. Liu, C. Ott, S. M. Cavaletto, Z. Harman, C. H. Keitel, and T. Pfeifer
New Journal of Physics 16, 093005 (2014)

1.276 Robust Signatures of Quantum Radiation Reaction in Focused Ultrashort Laser Pulses

J. Li, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 113, 044801 (2014)

1.275 Plasma-Based Generation and Control of a Single Few-Cycle High-Energy Ultrahigh-Intensity Laser Pulse

M. Tamburini, A. Di Piazza, T. V. Liseykina, and C. H. Keitel
Physical Review Letters 113, 025005 (2014)

1.274 Broadband high-resolution X-ray frequency combs

S. M. Cavaletto, Z. Harman, C. Ott, C. Buth, T. Pfeifer, and C. H. Keitel
Nature Photonics 8, 520-523 (2014)
 MPIK-Pressemitteilung: Ein Kamm aus Röntgenlicht
 Welt der Physik: Ein Kamm aus Röntgenlicht
 Physics World: Plans unveiled for world’s first X-ray frequency comb

1.273 Relativistic spin operators in various electromagnetic environments

H. Bauke, S. Ahrens, C. H. Keitel, and R. Grobe
Physical Review A 89, 052101 (2014)

1.272 What is the relativistic spin operator?

H. Bauke, S. Ahrens, C. H. Keitel, and R. Grobe
New Journal of Physics 16, 043012 (2014)

1.271 Quasiclassical propagator of a relativistic particle via the path-dependent gauge potential

E. Yakaboylu, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 89, 032115 (2014)

1.270 High-precision measurement of the atomic mass of the electron

S. Sturm, F. Köhler, J. Zatorski, Z. Harman, G. Werth, C. H. Keitel, and K. Blaum
Nature 506, 467-470 (2014)
 Nature News & Views: Fundamental constants: the teamwork of precision
 MPIK-Pressemitteilung: Das Elektron auf der Waage
 MPG press release: Electron on the scale
 pro-physik.de: Präzisionswaage für Elektronen
 Spiegel Online: Präzisionswaage: Den Elefanten zur Mücke gemacht
 Die Welt: Forscher ermitteln die wahre Masse von Elektronen
 Discovery News: Electron Mass Measured to Record-Breaking Precision
 Frankfurter Allgemeine Zeitung: Leichtgewicht auf der Waage
 Wiener Zeitung: Wie viel Masse hat ein Elektron?
 Le Figaro: La masse de l'électron est mieux connue
 El Pais: Precisión de récord para la masa del electrón

1.269 Dominant Secondary Nuclear Photoexcitation with the X-ray Free Electron Laser

J. Gunst, Y. A. Litvinov, C. H. Keitel, and A. Pálffy
Physical Review Letters 112, 082501 (2014)
 APS Physics Viewpoint: Free-Electron Lasers Trigger Nuclear Transitions
 MPIK-Pressemitteilung: Elektronen wirksamer als Röntgenlaser
 Phys. Rev. Lett.: Editors‘ suggestion
 GSI-Pressemitteilung: Aus der Ruhe gebracht
 Welt der Physik: Kernisomere als Energiespeicher

1.268 Electron dynamics controlled via self-interaction

M. Tamburini, C. H. Keitel, and A. Di Piazza
Physical Review E 89, 021201 (2014)

1.267 Higgs boson creation in laser-boosted lepton collisions

S. Müller, C. H. Keitel, and C. Müller
Physics Letters B 730, 161-165 (2014)

1.266 Optical control of an atomic inner-shell x-ray laser

G. Darvasi, C. H. Keitel, and C. Buth
Physical Review A 89, 013823 (2014)

1.265 Relativistic features and time delay of laser-induced tunnel-ionization

E. Yakaboylu, M. Klaiber, H. Bauke, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 88, 063421 (2013)

1.264 Major role of multielectronic K-L intershell resonant recombination processes in Li- to O-like ions of Ar, Fe, and Kr

C. Beilmann, Z. Harman, P. H. Mokler, S. Bernitt, C. H. Keitel, J. Ullrich, and J. R. Crespo López-Urrutia
Physical Review A 88, 062706, 1-11 (2013)
 Phys. Rev. A: Editors’ suggestion

1.263 X-ray frequency combs from optically controlled resonance fluorescence

S. M. Cavaletto, Z. Harman, C. Buth, and C. H. Keitel
Physical Review A 88, 063402 (2013)

1.262 Laser-driven generation of collimated ultra-relativistic positron beams

G. Sarri, W. Schumaker, A. Di Piazza, K. Poder, J. M. Cole, M. Vargas, D. Doria, S. Kushel, B. Dromey, G. Grittani, L. Gizzi, M. E. Dieckmann, A. Green, V. Chvykov, A. Maksimchuk, V. Yanovsky, Z. H. He, B. X. Hou, J. A. Nees, S. Kar, Z. Najmudin, A. G. R. Thomas, C. H. Keitel, K. Krushelnick, and M. Zepf
Plasma Physics and Controlled Fusion 55, 124017 (2013)

1.261 Nuclear-size self-energy and vacuum-polarization corrections to the bound-electron g factor

V. A. Yerokhin, C. H. Keitel, and Z. Harman
Journal of Physics B: Atomic, Molecular and Optical Physics 46, 245002 (2013)

1.260 Coronium in the laboratory: measuring the Fe XIV green coronal line by laser spectroscopy

K. Schnorr, V. Mäckel, N. S. Oreshkina, S. Augustin, F. R. Brunner, Z. Harman, C. H. Keitel, J. H. Ullrich, and J. R. Crespo López-Urrutia
The Astrophysical Journal, Supplement Series 776, 121 (2013)

1.259 Attosecond pulses at kiloelectronvolt photon energies from high-order-harmonic generation with core electrons

C. Buth, F. He, J. H. Ullrich, C. H. Keitel, and K. Z. Hatsagortsyan
Physical Review A 88, 033848 (2013)

1.258 Radiation-Reaction-Force-Induced Nonlinear Mixing of Raman Sidebands of an Ultraintense Laser Pulse in a Plasma

N. Kumar, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 111, 105001 (2013)

1.257 High-quality multi-GeV electron bunches via cyclotron autoresonance

B. J. Galow, J. Li, Y. I. Salamin, Z. Harman, and C. H. Keitel
Physical Review Special Topics-Accelerators and Beams 16, 081302, 1-6 (2013)

1.256 Quantum interference effects in an ensemble of 229Th nuclei interacting with coherent light

S. Das, A. Pálffy, and C. H. Keitel
Physical Review C 88, 024601, 1-14 (2013)

1.255 Polarization operator for plane-wave background fields

S. Meuren, C. H. Keitel, and A. Di Piazza
Physical Review D 88, 013007, 1-19 (2013)

1.254 The Kapitza-Dirac effect in the relativistic regime

S. Ahrens, H. Bauke, C. H. Keitel, and C. Müller
Physical Review A 88, 012115, 1-14 (2013)

1.253 Nuclear recollisions in laser-assisted α decay

H. M. Castañeda Cortés, C. Müller, C. H. Keitel, and A. Pálffy
Physics Letter B 723, 401-405 (2013)

1.252 A table-top laser-based source of femtosecond, collimated, ultra-relativistic positron beams

G. Sarri, W. Schumaker, A. Di Piazza, M. Vargas, B. Dromey, M. E. Dieckmann, V. Chvykov, A. Maksimchuk, V. Yanovsky, Z. H. He, B. X. Hou, J. A. Nees, A. G. R. Thomas, C. H. Keitel, M. Zepf, and K. Krushelnick
Physical Review Letters; American Physical Society., Woodbury, N.Y., etc. 110, 255002, 1-5 (2013)
 MPIK-Pressemitteilung: Optisch erzeugte Antimaterie
 APS Synopsis: Tabletop Particle Accelerator
 Latest Choice in New Scientist: Tabletop accelerator shoots cheap antimatter bullets

1.251 A three-beam setup for coherently controlling nuclear state population

W. Liao, A. Pálffy, and C. H. Keitel
Physical Review C 87, 054609, 1-12 (2013)
 Phys. Rev. C: Editors’ suggestion

1.250 Lorentz meets Fano spectral line shapes: A universal phase and its laser control

C. Ott, A. Kaldun, P. Raith, K. Meyer, M. Laux, J. Evers, C. H. Keitel, C. H. Greene, and T. Pfeifer
Science 340, 716-720 (2013)
 MPIK-Pressemitteilung: Die Spur der Zeit im optischen Spektrum
 MPG-Pressemitteilung: Die Spur der Zeit im optischen Spektrum

1.249 Collapse-and-revival dynamics of strongly laser-driven electrons

O. Skoromnik, I. D. Feranchuk, and C. H. Keitel
Physical Review A 87, 052107, 1-16 (2013)

1.248 Under-the-barrier dynamics in laser-induced relativistic tunneling

M. Klaiber, E. Yakaboylu, H. Bauke, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 110, 153004, 1-5 (2013)
 MPIK-Pressemitteilung: Tunneleffekt relativistisch betrachtet
 MPG-Pressemitteilung: Tunneln nahe der Lichtgeschwindigkeit
 idw press release: Relativistic tunnelling

1.247 Interference-induced peak splitting in EUV superfluorescence

N. Cui, C. H. Keitel, and M. Macovei
Optics Letters 38, 570-572 (2013)

1.246 X-ray quantum optics

B. W. Adams, C. Buth, S. M. Cavaletto, J. Evers, Z. Harman, C. H. Keitel, A. Pálffy, A. Picón, R. Röhlsberger, Y. Rostovtsev, and K. Tamasaku
Journal of Modern Optics 60, 2-21 (2013)

1.245 Negative refraction with tunable absorption in an active dense gas of atoms

P. P. Orth, R. Hennig, C. H. Keitel, and J. Evers
New Journal of Physics 15, 013027, 1-18 (2013)

1.244 Coherence-enhanced optical determination of the 229Th isomeric transition

W. Liao, S. Das, C. H. Keitel, and A. Pálffy
Physical Review Letters 109, 262502, 1-5 (2012)

1.243 An unexpectedly low oscillator strength as the origin of the Fe XVII emission problem

S. Bernitt, G. V. Brown, J. K. Rudolph, R. F. Steinbrügge, A. Graf, M. Leutenegger, S. Epp, S. Eberle, K. Kubicek, V. Mäckel, M. C. Simon, E. Träbert, E. W. Magee, C. Beilmann, N. Hell, S. Schippers, A. Müller, S. M. Kahn, A. Surzhykov, Z. Harman, C. H. Keitel, J. Clementson, F. S. Porter, W. Schlotter, J. J. Turner, J. H. Ullrich, P. Beiersdorfer, and J. R. Crespo López-Urrutia
Nature 492, 225-228 (2012)
 MPG-Pressemitteilung: Hot iron in the cosmos
 pro-physik.de: Transportable Ionenfalle erklärt Röntgenhimmel

1.242 Coherent Storage and Phase Modulation of Single Hard-X-Ray Photons Using Nuclear Excitons

W. Liao, A. Pálffy, and C. H. Keitel
Physical Review Letters 109, 197403 (2012)
 APS Physics Focus: Storing an X-ray Photon
 Pressemitteilung idw: Gespeicherte Röntgenphotonen - Edelstahl könnte in Zukunft Daten speichern
 Der Standard: Edelstahl könnte in Zukunft als ultradichter Datenspeicher dienen
 MPIK-Pressemitteilung: Gespeicherte Röntgenphotonen

1.241 Photon-photon scattering in collisions of laser pulses

B. King and C. H. Keitel
New Journal of Physics 14, 103002, 1-22 (2012)

1.240 Cooperative effects in nuclear excitation with coherent x-ray light

A. Junker, A. Palffy, and C. H. Keitel
New Journal of Physics 14, 085025, 1-21 (2012)

1.239 Extremely high-intensity laser interactions with fundamental quantum systems

A. Di Piazza, C. Müller, K. Z. Hatsagortsyan, and C. H. Keitel
Reviews of Modern Physics 84, 1177-1228 (2012)

1.238 Spin Dynamics in the Kapitza-Dirac Effect

S. Ahrens, H. Bauke, C. H. Keitel, and C. Müller
Physical Review Letters 109, 043601, 1-5 (2012)

1.237 Laser acceleration of proton bunches by petawatt chirped linearly polarized laser pulses

J. Li, Y. Salamin, B. J. Galow, Z. Harman, and C. H. Keitel
Physical Review A 85, 063831, 1-11 (2012)

1.236 Optimization of the recollision step in high-order harmonic generation

M. Klaiber, M. C. Kohler, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 85, 063829, 1-8 (2012)

1.235 Acceleration of proton bunches by petawatt chirped radially polarized laser pulses

J. Li, Y. I. Salamin, B. J. Galow, and C. H. Keitel
Physical Review A 85, 063832, 1-12 (2012)

1.234 Manipulating the Annihilation Dynamics of Positronium via Collective Radiation

N. Cui, M. Macovei, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 108, 243401, 1-5 (2012)

1.233 Generation of correlated photon pairs in different frequency ranges

F. Oster, C. H. Keitel, and M. Macovei
Physical Review A 85, 063814, 1-5 (2012)

1.232 QED calculation of the nuclear magnetic shielding for hydrogenlike ions

V. A. Yerokhin, K. Pachucki, Z. Harman, and C. H. Keitel
Physical Review A 85, 022512 (2012)

1.231 Nuclear Shape Effect on the g Factor of Hydrogenlike Ions

J. Zatorski, N. S. Oreshkina, C. H. Keitel, and Z. Harman
Physical Review Letters 108, 063005, 1-5 (2012)

1.230 Coherent x-ray generation from below-threshold harmonics

J. Liu, M. C. Kohler, C. H. Keitel, and K. Z. Hatsagortsyan
Physical Review A 84, 063817 (2011)

1.229 Accelerating the Fourier split operator method via graphics processing units

H. Bauke and C. H. Keitel
Computer Physics Communications 182, 2454-2463 (2011)

1.228 Dense monoenergetic proton beams from chirped laser-plasma interaction

B. Galow, Y. I. Salamin, T. V. Liseykina, Z. Harman, and C. H. Keitel
Physical Review Letters 107, 185002 (2011)
 idw press release: Hochwertige energiereiche und dichte Ionenstrahlen durch Laserbeschleunigung
 pro-physik.de: Laserbeschleunigte Ionenstrahlen für Krebstherapie modelliert

1.227 Nuclear coherent population transfer with x-ray laser pulses

W. Liao, A. Pálffy, and C. H. Keitel
Physics Letters B 705, 134-138 (2011)

1.226 Prominent Higher-Order Contributions to Electronic Recombination

C. Beilmann, P. Mokler, S. Bernitt, C. H. Keitel, J. H. Ullrich, J. R. Crespo López-Urrutia, and Z. Harman
Physical Review Letters 107, 143201 (2011)
 Phys. Rev. Lett.: Editors‘ suggestion
 APS Physics (Synopsis): Crowded Recombination
 Pressemitteilung idw: Synchrone Quantensprünge bei Elektronen-Einfang in hochgeladene Ionen
 MPIK-Pressemitteilung: Synchrone Quantensprünge bei Elektronen-Einfang in hochgeladenen Ionen

1.225 Time analysis of above-threshold ionization in extreme-ultraviolet laser pulses

H. Ebadi, C. H. Keitel, and K. Z. Hatsagortsyan
Physical Review A 83, 063418 (2011)

1.224 QED Theory of the Nuclear Magnetic Shielding in Hydrogenlike Ions

V. A. Yerokhin, K. Pachucki, C. H. Keitel, and Z. Harman
Physical Review Letters 107, 043004 (2011)

1.223 Streaking at high energies with electrons and positrons

A. Ipp, J. Evers, C. H. Keitel, and K. Z. Hatsagortsyan
Physics Letters B 702, 383-387 (2011)

1.222 g Factor of Hydrogenlike 28Si13+

S. Sturm, A. Wagner, B. Schabinger, J. Zatorski, Z. Harman, W. Quint, G. Werth, C. H. Keitel, and K. Blaum
Physical Review Letters 107, 023002 (2011)
 Phys. Rev. Lett.: Editors’ suggestion
 APS Physics (Synopsis): QED passes with flying colors
 MPG-Pressemitteilung: Quantenelektrodynamik auf dem Prüfstand

1.221 Relativistic ionization characteristics of laser-driven hydrogenlike ions

H. Bauke, H. Hetzheim, G. R. Mocken, M. Ruf, and C. H. Keitel
Physical Review A 83, 063414 (2011)

1.220 Higher-order resonant inter-shell electronic recombination for heavy highly charged ions

C. Beilmann, P. H. Mokler, S. Bernitt, Z. Harman, C. H. Keitel, O. Postavaru, J. H. Ullrich, and J. R. Crespo López-Urrutia
Physica Scripta T T144, 014014 (2011)

1.219 Coherent control of the cooperative branching ratio for nuclear x-ray pumping

A. Pálffy, C. H. Keitel, and J. Evers
Physical review / B 83, 155103 (2011)

1.218 Phase-matched coherent hard X-rays from relativistic high-order harmonic generation

M. Kohler, M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Europhysics letters 94, 14002 (2011)

1.217 Attochirp-free High-order Harmonic Generation

M. C. Kohler, C. H. Keitel, and K. Z. Hatsagortsyan
Optics Express 19, 4411-4420 (2011)
 Nature Photonics Research Highlights: Our choice from the recent literature

1.216 High-Precision Metrology of Highly Charged Ions via Relativistic Resonance Fluorescence

O. Postavaru, Z. Harman, and C. H. Keitel
Physical Review Letters 106, 033001 (2011)

1.215 Radiation reaction effects on electron nonlinear dynamics and ion acceleration in laser-solid interaction

M. Tamburini, F. Pegoraro, A. Di Piazza, C. H. Keitel, T. V. Liseykina, and A. Macchi
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 653, 181-185 (2011)

1.214 High-order harmonic generation enhanced by XUV light

C. Buth, M. C. Kohler, J. H. Ullrich, and C. H. Keitel
Optics Letters 36, 3530-3532 (2011)

1.213 Optimizing direct intense-field laser acceleration of ions

Z. Harman, Y. Salamin, B. Galow, and C. H. Keitel
Physical Review A 84, 053814 (2011)

1.212 Radiation reaction effects on radiation pressure acceleration

M. Tamburini, F. Pegoraro, A. Di Piazza, C. H. Keitel, and A. Macchi
New Journal of Physics 12, 123005, 1-14 (2010)

1.211 Intense high-quality medical proton beams via laser fields

B. Galow, Z. Harman, and C. H. Keitel
Optics Express 18, 25950-25957 (2010)

1.210 Quantum Radiation Reaction Effects in Multiphoton Compton Scattering

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 105, 220403, 1-4 (2010)

1.209 High Harmonic Generation Via Continuum Wave-Packet Interference

M. Kohler, C. Ott, P. Raith, R. Heck, I. Schlegel, C. H. Keitel, and T. Pfeifer
Physical Review Letters 105, 203902, 1-4 (2010)

1.208 Resonant and Near-Threshold Photoionization Cross Sections of Fe14+

M. C. Simon, J. R. C. Lopez-Urrutia, C. Beilmann, M. Schwarz, Z. Harman, S. W. Epp, B. L. Schmitt, T. M. Baumann, E. Behar, S. Bernitt, R. Follath, R. Ginzel, C. H. Keitel, R. Klawitter, K. Kubicek, V. Mackel, P. H. Mokler, G. Reichardt, O. Schwarzkopf, and J. Ullrich
Physical Review Letters 105, 183001 (2010)
 MPG-Pressemitteilung: Der letzte Schrei aus dem Schwarzen Loch
 Astronews: Die letzten Schreie der Materie
 Phys.org: Physicists produce black hole plasma in the lab

1.207 Double-slit vacuum polarization effects in ultraintense laser fields

B. King, A. Di Piazza, and C. H. Keitel
Physical Review A 82, 032114 (2010)

1.206 Complete QED Theory of Multiphoton Trident Pair Production in Strong Laser Fields

H. Hu, C. Müller, and C. H. Keitel
Physical Review Letters 105, 080401 (2010)

1.205 Determining the Carrier-Envelope Phase of Intense Few-Cycle Laser Pulses

F. Mackenroth, A. Di Piazza, and C. H. Keitel
Physical Review Letters 105, 063903 (2010)

1.204 Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei

A. Di Piazza, E. Lötstedt, A. I. Milstein, and C. H. Keitel
Physical Review A 81, 062122 (2010)

1.203 Photoionization of N3+ and Ar8+ in an electron beam ion trap by synchrotron radiation

M. C. Simon, M. Schwarz, S. W. Epp, C. Beilmann, B. L. Schmitt, Z. Harman, T. M. Baumann, P. H. Mokler, S. Bernitt, R. Ginzel, S. G. Higgins, C. H. Keitel, R. Klawitter, K. Kubicek, V. Mäckel, J. Ullrich, and J. R. Crespo López-Urrutia
Journal of Physics B: Atomic, Molecular and Optical Physics 43, 065003, 1-11 (2010)

1.202 Squeezing in strong light scattered by a regular structure of atoms

L. L. Jin, M. Macovei, S. Q. Gong, C. H. Keitel, and J. Evers
Optics Communications 283, 790-794 (2010)

1.201 Nonperturbative multiphoton electron-positron-pair creation in laser fields

G. R. Mocken, M. Ruf, C. Müller, and C. H. Keitel
Physical Review A 81, 022122 (2010)

1.200 A matterless double slit

B. King, A. Di Piazza, and C. H. Keitel
Nature Photonics 4, 92-94 (2010)
 Cover of the February 2010 issue of Nature Photonics
 Nature Photonics News & Views: Probing the quantum vacuum
 MPG-Pressemitteilung: Licht streut Licht
 press release: A matterless idw double-slit

1.199 Quantum entanglement in dense multiqubit systems

M. Macovei, J. Evers, and C. H. Keitel
Journal of Modern Optics 57, 1287-1292 (2010)

1.198 A real space split operator method for the Klein-Gordon equation

M. Ruf, H. Bauke, and C. H. Keitel
Journal of Computational Physics 228, 9092-9106 (2009)

1.197 Isotope shifts in dielectronic recombination : From stable to in-flight-produced nuclei

C. Brandau, C. Kozhuharov, A. Müller, D. Bernhardt, S. Böhm, D. Boutin, F. J. Currell, C. Dimopoulou, B. Franzke, Z. Harman, J. D. Jentschura, C. H. Keitel, H. J. Kluge, Y. S. Kozhedub, R. Krücken, Y. A. Litvinov, F. Nolden, B. O'Rourke, R. Reuschl, S. Schippers, V. M. Shabaev, U. Spillmann, Z. Stachura, M. Steck, T.. Stöhlker, I. I. Tupitsyn, D. F. Winters, and A. Wolf
Journal of Physics: Conference Series 194, 012023 (2009)

1.196 Intershell trielectronic recombination with K-shell excitation in Kr30+

C. Beilmann, O. Postavaru, L. H. Arntzen, R. Ginzel, C. H. Keitel, V. Mackel, P. H. Mokler, M. C. Simon, H. Tawara, I. I. Tupitsyn, J. Ullrich, J. R. Crespo López-Urrutia, and Z. Harman
Physical Review A 80, 050702 (2009)

1.195 Laser-guided relativistic quantum dynamics

C. Liu, M. C. Kohler, K. Z. Hatsagortsyan, C. Müller, and C. H. Keitel
New Journal of Physics 11, 105045 (2009)

1.194 Barrier Control in Tunneling e(+)-e(-) Photoproduction

A. Di Piazza, E. Lötstedt, A. I. Milstein, and C. H. Keitel
Physical Review Letters 103, 170403 (2009)

1.193 Yoctosecond Photon Pulses from Quark-Gluon Plasmas

A. Ipp, C. H. Keitel, and J. Evers
Physical Review Letters 103, 152301 (2009)
 Phys. Rev. Lett.: Editors' suggestion
 Nature: Holy Yocto! (Research Highlight in Nature)
 Physics Today: Yoctosecond light pulses from quark–gluon plasmas
 New Scientist: Big-bang plasma-soup flashgun to snap atomic anatomy
 IOP Physicsworld.com: Enter the yoctosecond
 APS Physics (Synopsis): The shortest known optical pulses
 pro-physik.de: Kürzeste Lichtblitze aus ultraheißer Materie
 Expedition Zukunft: Kürzeste Lichtblitze von Quarks and Co.
 Österreichischer Rundfunk: Neue Methode für ultrakurze Lichtblitze
 Wiener Zeitung: Vor Weltrekord für kurze Lichtpulse?
 Der Standard: “Zeitmikroskop“ mit einer Auflösung im Yoktosekunden-Bereich

1.192 Probing quantum superposition states with few-cycle laser pulses

X. T. Xie, M. Macovei, M. Kiffner, and C. H. Keitel
Journal of the Optical Society of America B -Optical Physics 26, 1912-1917 (2009)

1.191 Exotic atoms in superintense laser fields : applications in atomic, nuclear, and particle physics

C. Müller, A. Shahbaz, T. J. Bürvenich, K. Z. Hatsagortsyan, and C. H. Keitel
European Physical Journal - Special Topics 175, 187-190 (2009)

1.190 Relativistic nonperturbative above-threshold phenomena in strong laser fields

C. Müller, K. Z. Hatsagortsyan, M. Ruf, S. J. Müller, H. G. Hetzheim, M. C. Kohler, and C. H. Keitel
Laser Physics 19, 1743-1752 (2009)

1.189 Single-Photon Entanglement in the keV Regime via Coherent Control of Nuclear Forward Scattering

A. Pálffy, C. H. Keitel, and J. Evers
Physical Review Letters 103, 017401 (2009)

1.188 Canonical transforms and the efficient integration of quantum mechanical wave equations

H. Bauke and C. H. Keitel
Physical Review E 80, 016706 (2009)

1.187 Spontaneous emission interference in negative-refractive-index waveguides

G. X. Li, J. Evers, and C. H. Keitel
Physical Review B 80, 045102 (2009)

1.186 Strong Signatures of Radiation Reaction below the Radiation-Dominated Regime

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 102, 254802 (2009)

1.185 Laser-induced nonresonant nuclear excitation in muonic atoms

A. Shahbaz, C. Müller, T. J. Bürvenich, and C. H. Keitel
Nuclear Physics A 821, 106-117 (2009)

1.184 Lepton pair production in high-frequency laser fields

C. Müller, C. Deneke, M. Ruf, G. R. Mocken, K. Z. Hatsagortsyan, and C. H. Keitel
Laser Physics 19, 791-796 (2009)

1.183 Ionization Dynamics versus Laser Intensity in Laser-Driven Multiply Charged Ions

H. G. Hetzheim and C. H. Keitel
Physical Review Letters 102, 083003 (2009)

1.182 Pair Production in Laser Fields Oscillating in Space and Time

M. Ruf, G. R. Mocken, C. Müller, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 102, 080402 (2009)

1.181 Coulomb-field-induced conversion of a high-energy photon into a pair assisted by a counterpropagating laser beam

E. Lötstedt, U. D. Jentschura, and C. H. Keitel
New Journal of Physics 11, 013054 (2009)

1.180 Robust coherent preparation of entangled states of two coupled flux qubits via dynamic control of the transition frequencies

K. Y. Xia, M. Macovei, J. Evers, and C. H. Keitel
Physical Review B 79, 024519 (2009)

1.179 Antimatter: Abundant positron production

C. Müller and C. H. Keitel
Nature Photonics 3, 245-246 (2009)

1.178 Correlated atomic population fluctuations via the environmental reservoir

M. Macovei, Y. P. Niu, S. Q. Gong, and C. H. Keitel
Journal of Modern Optics 56, 704-709 (2009)

1.177 Laser photon merging in proton laser collisions

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 78, 062109 (2008)

1.176 Laser channeling of Bethe-Heitler pairs

E. Lötstedt, U. D. Jentschura, and C. H. Keitel
Physical Review Letters 101, 203001, 1-4 (2008)

1.175 Muon pair creation from positronium in a linearly polarized laser field

C. Müller, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 78, 033408, 1-19 (2008)

1.174 Muon-pair creation by two x-ray laser photons in the field of an atomic nucleus

C. Müller, C. Deneke, and C. H. Keitel
Physical Review Letters 101, 060402, 1-4 (2008)

1.173 Photon polarization as a probe for quark-gluon plasma dynamics

A. Ipp, A. Di Piazza, J. Evers, and C. H. Keitel
Physics Letters B 666, 315-319 (2008)

1.172 Laser-driven relativistic recollisions

K. Z. Hatsagortsyan, M. Klaiber, C. Müller, M. C. Kohler, and C. H. Keitel
Journal of the Optical Society of America B-Optical Physics 25, B92-B103 (2008)

1.171 FFT-split-operator code for solving the Dirac equation in 2+1 dimensions

G. R. Mocken and C. H. Keitel
Computer Physics Communications 178, 868-882 (2008)

1.170 Direct high-power laser acceleration of ions for medical applications

Y. I. Salamin, Z. Harman, and C. H. Keitel
Physical Review Letters 100, 155004, 1-4 (2008)
 Pressemitteilung idw: Direkte Laser-Beschleunigung von Ionen für medizinische Anwendungen
 Pressemitteilung idw: Direkte Laser-Beschleunigung von Ionen für medizinische Anwendungen uni-protokolle.de: Direkte Laser-Beschleunigung von Ionen für medizinische Anwendungen

1.169 Photoemission of a single-electron wave packet in a strong laser field

J. Peatross, C. Müller, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 100, 153601, 1-4 (2008)

1.168 Electric-dipole-forbidden nuclear transitions driven by super-intense laser fields

A. Pálffy, J. Evers, and C. H. Keitel
Physical Review C 77, 044602, 1-9 (2008)

1.167 Spatially entangled atomic deflections in twin-photon light beams

G. Y. Kryuchkyan, M. Macovei, and C. H. Keitel
Physical Review A 77, 035603, 1-4 (2008)

1.166 High-energy, nuclear and QED processes in strong laser fields

C. Müller, A. Di Piazza, A. Shahbaz, T. J. Bürvenich, J. Evers, K. Z. Hatsagortsyan, and C. H. Keitel
Laser Physics 18, 175-184 (2008)

1.165 Nuclear excitation by electron capture followed by fast x-ray emission

A. Pálffy, Z. Harman, C. Kozhuharov, C. Brandau, C. H. Keitel, W. Scheid, and T. Stöhlker
Physics Letters B 661, 330-334 (2008)

1.164 Isotope shift in the dielectronic recombination of three-electron ANd57+

C. Brandau, C. Kozhuharov, Z. Harman, A. Müller, S. Schippers, Y. S. Kozhedub, D. Bernhardt, S. Böhm, J. Jacobi, E. W. Schmidt, P. H. Mokler, F. Bosch, H.-J. Kluge, T. Stöhlker, K. Beckert, P. Beller, F. Nolden, M. Steck, A. Gumberidze, R. Reuschl, U. Spillmann, F. J. Currell, I. I. Tupitsyn, V. M. Shabaev, U. D. Jentschura, C. H. Keitel, A. Wolf, and Z. Stachura
Physical Review Letters 100, 073201 (2008)

1.163 Coherent hard x rays from attosecond pulse train-assisted harmonic generation

M. Klaiber, K. Z. Hatsagortsyan, C. Müller, and C. H. Keitel
Optics Letters 33, 411-413 (2008)

1.162 Particle physics with a laser-driven positronium atom

C. Müller, K. Z. Hatsagortsyan, and C. H. Keitel
Physics Letters B 659, 209-213 (2008)

1.161 Nonperturbative vacuum-polarization effects in proton-laser collisions

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 100, 010403 (2008)

1.160 Zeeman splitting and g factor of the 1s22s22p 2P3/2 and 2P1/2 levels in Ar13+

R. Soria Orts, J. R. Crespo López-Urrutia, H. Bruhns, A. J. G. Martinez, Z. Harman, U. D. Jentschura, C. H. Keitel, A. Lapierre, H. Tawara, I. I. Tupitsyn, J. Ullrich, and A. V. Volotka
Physical Review A 76, 052501 (2007)

1.159 Isomer triggering via nuclear excitation by electron capture

A. Palffy, J. Evers, and C. H. Keitel
Physical Review Letters 99, 172502 (2007)

1.158 Photon splitting in a laser field

A. Di Piazza, A. I. Milstein, and C. H. Keitel
Physical Review A 76, 032103 (2007)

1.157 Breakdown of the few-level approximation in collective systems

M. Kiffner, J. Evers, and C. H. Keitel
Physical Review A 76, 013807 (2007)

1.156 Nuclear signatures in high-order harmonic generation from laser-driven muonic atoms

A. Shahbaz, C. Müller, A. Staudt, T. J. Burvenich, and C. H. Keitel
Physical Review Letters 98, 263901 (2007)

1.155 Superbunched photons via a strongly pumped near-equispaced multiparticle system

M. Macovei and C. H. Keitel
Physical Review B 75, 245325 (2007)

1.154 Fully relativistic laser-induced ionization and recollision processes

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 75, 063413 (2007)

1.153 Electron wave-packet dynamics in a relativistic electromagnetic field: 3-D analytical approximation

J. Peatross, C. Müller, and C. H. Keitel
Optics Express 15, 6053-6061 (2007)

1.152 Laser-assisted bremsstrahlung for circular and linear polarization

S. Schnez, E. Lötstedt, U. D. Jentschura, and C. H. Keitel
Physical Review A 75, 053412 (2007)

1.151 Nonlinear interaction of strong laser fields in vacuum

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Laser Physics 17, 345-349 (2007)

1.150 Strongly enhanced high-harmonic generation via antisymmetric ionic states

R. Fischer, M. Lein, and C. H. Keitel
Journal of Physics B-Atomic Molecular and Optical Physics 40, F113-F119 (2007)

1.149 Enhancement of vacuum polarization effects in a plasma

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physics of Plasma 14, 032102 (2007)

1.148 Refocussed relativistic recollisions

M. Verschl and C. H. Keitel
Europhysics Letters 77, 64004, 1-5 (2007)

1.147 Coherent control in a decoherence-free subspace of a collective multilevel system

M. Kiffner, J. Evers, and C. H. Keitel
Physical Review A 75, 032313 (2007)

1.146 Two-mode single-atom laser as a source of entangled light

M. Kiffner, M. S. Zubairy, J. Evers, and C. H. Keitel
Physical Review A 75, 033816 (2007)

1.145 Impact of a static magnetic field on high-order harmonic spectra

R. Fischer, C. H. Keitel, R. Jung, G. Pretzler, and O. Willi
Physical Review A 75, 033401 (2007)

1.144 Localization of atomic ensembles via superfluorescence

M. Macovei, J. Evers, C. H. Keitel, and M. S. Zubairy
Physical Review A 75, 033801 (2007)

1.143 Relativistic recollisions with two consecutive laser pulses

M. Verschl and C. H. Keitel
Journal of Physics B-Atomic Molecular and Optical Physics 40, F69-F76 (2007)

1.142 Relativistic classical and quantum dynamics in intense crossed laser beams of various polarizations

M. Verschl and C. H. Keitel
Physical Review Special Topics-Accelerators and Beams 10, 024001 (2007)

1.141 Nonsequential double recombination in intense laser fields

P. Koval, F. Wilken, D. Bauer, and C. H. Keitel
Physical Review Letters 98, 043904 (2007)

1.140 Strong-field spatial interference in a tailored electromagnetic bath

M. Macovei, J. Evers, G. X. Li, and C. H. Keitel
Physical Review Letters 98, 043602, 1-4 (2007)

1.139 Evaluation of laser-assisted bremsstrahlung with Dirac-Volkov propagators

E. Lötstedt, U. D. Jentschura, and C. H. Keitel
Physical Review Letters 98, 043002 (2007)

1.138 Enhanced recollision dynamics via the combination of antisymmetric wave functions and beyond-dipole effects

R. Fischer, M. Lein, and C. H. Keitel
Journal of Modern Optics 54, 1911-1926 (2007)

1.137 Laser-induced dynamic radiative corrections in the dressed-state and in the Floquet picture

G. Y. Kryuchkyan, U. D. Jentschura, J. Evers, and C. H. Keitel
Journal of Modern Optics 54, 1481-1495 (2007)

1.136 Relativistic ionization rescattering with tailored laser pulses

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 74, 051803, 1-4 (2006)

1.135 Photoionization broadening of the 1S-2S transition in a beam of atomic hydrogen

N. Kolachevsky, M. Haas, U. D. Jentschura, M. Herrmann, P. Fendel, M. Fischer, R. Holzwarth, T. Udem, C. H. Keitel, and T. W. Hänsch
Physical Review A 74, 052504, 1-9 (2006)

1.134 Muon pair creation from positronium in a circularly polarized laser field

C. Müller, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review D 74, 074017, 1-16 (2006)

1.133 Dynamic nuclear Stark shift in superintense laser fields

T. J. Bürvenich, J. Evers, and C. H. Keitel
Physical Review C 74, 044601, 1-9 (2006)

1.132 Enhanced Recollisions for Antisymmetric Molecular Orbitals in Intense Laser Fields

R. Fischer, M. Lein, and C. H. Keitel
Physical Review Letters 97, 143901, 1-4 (2006)

1.131 Exploring Relativistic Many-Body Recoil Effects in Highly Charged Ions

R. Soria Orts, Z. Harman, J. R. Crespo López-Urrutia, A. N. Artemyev, H. Bruhns, A. J. González Martínez, U. D. Jentschura, C. H. Keitel, A. Lapierre, V. Mironov, V. M. Shabaev, H. Tawara, I. I. Tupitsyn, J. Ullrich, and A. V. Volotka
Physical Review Letters 97, 103002, 1-4 (2006)

1.130 Microscopic laser-driven high-energy colliders

K. Z. Hatsagortsyan, C. Müller, and C. H. Keitel
Europhysics Letters 76, 29-35 (2006)

1.129 Light Diffraction by a Strong Standing Electromagnetic Wave

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 97, 083603, 1-4 (2006)

1.128 Controlling multiparticle correlations with a strong laser field

M. Dal Col, M. Macovei, and C. H. Keitel
Optics Communications 264, 407-412 (2006)

1.127 Collective coherent population trapping in a thermal field

M. Macovei, Z. Ficek, and C. H. Keitel
Physical Review A 73, 063821 (2006)

1.126 Interference in the resonance fluorescence of two incoherently coupled transitions

M. Kiffner, J. Evers, and C. H. Keitel
Physical Review A 73, 063814 (2006)

1.125 Polarization-operator approach to electron-positron pair production in combined laser and Coulomb fields

A. I. Milstein, C. Müller, K. Z. Hatsagortsyan, U. D. Jentschura, and C. H. Keitel
Physical Review A 73, 062106 (2006)

1.124 Gauge-invariant relativistic strong-field approximation

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 73, 053411 (2006)

1.123 Benchmarking high-field few-electron correlation and QED contributions in Hg75+ to Hg78+ ions: I. Experiment

A. J. González-Martínez, J. R. Crespo López-Urrutia, J. Braun, G. Brenner, H. Bruhns, A. Lapierre, V. Mironov, R. Soria Orts, H. Tawara, M. Trinczek, J. Ullrich, A. N. Artemyev, Z. Harman, U. D. Jentschura, C. H. Keitel, J. H. Scofield, and I. I. Tupitsyn
Physical Review A 73, 052710, 1-10 (2006)

1.122 Benchmarking high-field few-electron correlation and QED contributions in Hg75+ to Hg78+ ions: II. Theory

Z. Harman, I. I. Tupitsyn, A. N. Artemyev, U. D. Jentschura, C. H. Keitel, A. J. González Martínez, J. R. Crespo López-Urrutia, H. Tawara, and J. Ullrich
Physical Review A 73, 052711, 1-13 (2006)

1.121 Two-photon excitation dynamics in bound two-body Coulomb systems including ac Stark shift and ionization

M. Haas, U. D. Jentschura, C. H. Keitel, N. Kolachevsky, M. Herrmann, P. Fendel, M. Fischer, T. Udem, R. Holzwarth, T. W. Hänsch, M. O. Scully, and G. S. Agarwal
Physical Review A 73, 052501 (2006)

1.120 Two-electron ionization and stabilization beyond the dipole approximation

A. Staudt and C. H. Keitel
Physical Review A 73, 043412 (2006)

1.119 Nuclear Quantum Optics with X-Ray Laser Pulses

T. J. Bürvenich, J. Evers, and C. H. Keitel
Physical Review Letters 96, 142501 (2006)

1.118 Quantum Interference Enforced by Time-Energy Complementarity

M. Kiffner, J. Evers, and C. H. Keitel
Physical Review Letters 96, 100403, 1-4 (2006)

1.117 Relativistic high-power laser–matter interactions

Y. I. Salamin, S. X. Hu, K. Z. Hatsagortsyan, and C. H. Keitel
Physics Reports 427, 41-155 (2006)

1.116 Geometry-dependent dynamics of two Λ-type atoms via vacuum-induced coherences

J. Evers, M. Kiffner, M. Macovei, and C. H. Keitel
Physical Review A 73, 023804 (2006)

1.115 Ionization suppression of excited atomic states beyond the stabilization regime

A. Staudt, C. H. Keitel, and J. S. Briggs
Journal of Physics B 39, 633-639 (2006)

1.114 Comparison of classical and second quantized description of the dynamic Stark shift

M. Haas, U. D. Jentschura, and C. H. Keitel
American Journal of Physics 74, 77-81 (2006)

1.113 Quantum correlations of an atomic ensemble via an incoherent bath

M. Macovei, J. Evers, and C. H. Keitel
Physical Review A 72, 063809 (2005)

1.112 Laser-dressed vacuum polarization in a Coulomb field

A. I. Milstein, I. S. Terekhov, U. D. Jentschura, and C. H. Keitel
Physical Review A 72, 052104 (2005)

1.111 Relativistic electron correlation, quantum electrodynamics and the lifetime of the 1s22s22p 23/2 level in boronlike argon

A. Lapierre, U. D. Jentschura, J. R. Crespo López-Urrutia, J. Braun, G. Brenner, H. Bruhns, D. Fischer, A. J. González Martínez, Z. Harman, W. R. Johnson, C. H. Keitel, V. Mironov, C. J. Osborne, G. Sikler, R. Soria Orts, H. Tawara, I. I. Tupitsyn, J. Ullrich, and A. Volotka
Physical Review Letters 95, 183001, 1-4 (2005)

1.110 Rapid refractive index enhancements via laser-mediated collectivity

M. Macovei and C. H. Keitel
Journal of Physics B-Atomic Molecular and Optical Physics 38, L315-L321 (2005)

1.109 Harmonic generation from laser-driven vacuum

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review D 72, 085005 (2005)

1.108 Free-electron quantum signatures in intense laser fields

M. Mahmoudi, Y. I. Salamin, and C. H. Keitel
Physical Review A 72, 033402 (2005)

1.107 Thin crystal layers in superstrong laser fields: Dynamics and coherent x-ray generation

K. Z. Hatsagortsyan and C. H. Keitel
Physical Review A 72, 023812 (2005)

1.106 Low-frequency-field-induced spontaneous-emission interference in a two-level atom placed in an anisotropic photonic crystal

G. Li, J. Evers, and C. H. Keitel
Journal of Physics B-Atomic Molecular and Optical Physics 38, 1435-1451 (2005)

1.105 Above-threshold ionization beyond the dipole approximation

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 71, 033408, 1-7 (2005)

1.104 Coherent manipulation of collective three-level systems

M. Macovei, J. Evers, and C. H. Keitel
Physical Review A 71, 033802, 1-16 (2005)

1.103 Multiphoton quantum interference on a dipole-forbidden transition

U. Akram, J. Evers, and C. H. Keitel
Journal of Physics B 38, L69-L77 (2005)

1.102 Radiation spectra of laser-driven quantum relativistic electrons

G. R. Mocken and C. H. Keitel
Computer Physics Communications 166, 171-190 (2005)

1.101 Relativistic and radiative energy shifts for Rydberg states

U. D. Jentschura, E. Le Bigot, J. Evers, P. J. Mohr, and C. H. Keitel
Journal of Physics B 38, S97-S105 (2005)

1.100 Analytical Approach to Wave Packet Dynamics of Laser-Driven Particles beyond the Dipole Approximation

M. Verschl and C. H. Keitel
Laser Physics 15, 529-535 (2005)

1.99 Radiative Corrections to Multi-Level Mollow-Type Spectra

U. D. Jentschura, J. Evers, and C. H. Keitel
Laser Physics 15, 37-45 (2005)

1.98 Relativistic and radiative corrections to the Mollow spectrum

J. Evers, U. D. Jentschura, and C. H. Keitel
Physical Review A 70, 062111, 1-20 (2004)

1.97 Magnetic and thermal influences on collective resonance fluorescence

M. Macovei, J. Evers, and C. H. Keitel
Europhysics Letters 68, 391-397 (2004)

1.96 Double-EIT ground-state laser cooling without blue-sideband heating

J. Evers and C. H. Keitel
Europhysics Letters 68, 370-376 (2004)

1.95 Spontaneous-emission suppression via multiphoton quantum interference

J. Evers and C. H. Keitel
Journal of Physics B-Atomic Molecular and Optical Physics 37, 2771-2796 (2004)

1.94 Bound atomic dynamics in the MeV regime

G. R. Mocken and C. H. Keitel
Journal of Physics B-Atomic Molecular and Optical Physics 37, L275-L283 (2004)

1.93 Positronium in Intense Laser Fields

B. Henrich, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review Letters 93, 013601 (2004)

1.92 New Limits on the Drift of Fundamental Constants from Laboratory Measurements

M. Fischer, N. Kolachevsky, M. Zimmermann, R. Holzwarth, T. Udem, T. W. Hänsch, M. Abgrall, J. Grünert, I. Maksimovic, S. Bize, H. Marion, F. Pereira Dos Santos, P. Lemonde, G. Santarelli, P. Laurent, A. Clairon, C. Salomon, M. Haas, U. D. Jentschura, and C. H. Keitel
Physical Review Letters 92, 230802 (2004)

1.91 Quantum dynamics of relativistic electrons

G. Mocken and C. H. Keitel
Journal of Computational Physics 199, 558-588 (2004)

1.90 Simulation of atomic quantum dynamics in combined intense laser and weak electric fields

R. Fischer, A. Staudt, and C. H. Keitel
Computer Physics Communications 157, 139-146 (2004)

1.89 Radiative corrections in laser-dressed atoms: formalism and applications

U. D. Jentschura and C. H. Keitel
Annals of Physics 310, 1-55 (2004)

1.88 Lamb Shift of Laser-Dressed Atomic States

U. D. Jentschura, J. Evers, M. Haas, and C. H. Keitel
Physical Review Letters 91, 253601 (2003)

1.87 Phase Control of Collective Quantum Dynamics

M. Macovei, J. Evers, and C. H. Keitel
Physical Review Letters 91, 233601 (2003)

1.86 Quantum Signatures in Laser-Driven Relativistic Multiple Scattering

G. R. Mocken and C. H. Keitel
Physical Review Letters 91, 173202 (2003)

1.85 Laser Control of Collective Spontaneous Emission

M. Macovei and C. H. Keitel
Physical Review Letters 91, 123601 (2003)

1.84 Stabilization of helium in intense high-frequency laser pulses beyond the dipole approximation

A. Staudt and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 36, L203-L209 (2003)

1.83 Quasi-simultaneous double ionization of helium in super-intense high-frequency laser pulses

A. Staudt, J. Prager, and C. H. Keitel
Europhysics letters 62, 691-697 (2003)

1.82 Relativistische Quantendynamik in intensiven Laserfeldern

C. H. Keitel
Physik Journal 2, 61-65 (2003)

1.81 Low group velocity of light without an extra driving laser field

M. Haas and C. H. Keitel
Optics Communications 216, 385-389 (2003)

1.80 Relativistic electron dynamics in intense crossed laser beams: Acceleration and Compton harmonics

Y. I. Salamin, G. R. Mocken, and C. H. Keitel
Physical review E 67, 016501 (2003)

1.79 Optimum Conditions for Electron Acceleration Using Tightly Focused Laser Beams

Y. I. Salamin and C. H. Keitel
Laser Physics 13, 407-413 (2003)

1.78 Modifying spontaneous emission via interferences from incoherent pump fields

D. Bullock, J. Evers, and C. H. Keitel
Physics Letters. A 307, 3-12 (2002)

1.77 Electron scattering and acceleration by a tightly focused laser beam

Y. I. Salamin, G. R. Mocken, and C. H. Keitel
Physical Review Special Topics-Accelerators and Beams 5, 101301 (2002)

1.76 Spontaneous-Emission Suppression on Arbitrary Atomic Transitions

J. Evers and C. H. Keitel
Physical Review Letters 89, 163601 (2002)

1.75 Inhibiting decoherence via ancilla processes

G. Zeng and C. H. Keitel
Physical Review A 66, 022306 (2002)

1.74 A problematic set of two-loop self-energy corrections

U. D. Jentschura, J. Evers, K. Pachucki, and C. H. Keitel
New Journal of Physics 4, 49, 1-11 (2002)

1.73 Dark state suppression and narrow fluorescent feature in a laser-driven Λ atom

J. Evers, D. Bullock, and C. H. Keitel
Optics Communications 209, 173-179 (2002)

1.72 Resonant multiphoton X-ray optics with highly charged ions

M. Casu and C. H. Keitel
Europhysics Letters 58, 496-502 (2002)

1.71 Phase-matched high-harmonic generation from laser-driven crystals

K. Z. Hatsagortsyan and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 35, L175-L180 (2002)

1.70 Spin and radiation in intense laser fields

M. Walser, D. J. Urbach, K. Z. Hatsagortsyan, S. Hu, and C. H. Keitel
Physical Review A 65, 043410 (2002)

1.69 Arbitrated quantum-signature scheme

G. Zeng and C. H. Keitel
Physical Review A 64, 042312 (2002)

1.68 Laser-induced nonsequential double ionization approaching the relativistic regime

J. Prager and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 35, L167-L174 (2002)

1.67 Electron Acceleration by a Tightly Focused Laser Beam

Y. I. Salamin and C. H. Keitel
Physical Review Letters 88, 095005 (2002)

1.66 Narrow spectral feature in resonance fluorescence with a single monochromatic laser field

J. Evers and C. H. Keitel
Physical Review A 65, 033813 (2002)

1.65 Coherent x-ray pulse generation in the sub-Ångström regime

C. H. Keitel and S. X. Hu
Applied Physics Letters 80, 541-543 (2002)

1.64 Relativistic classical Monte Carlo simulations of stabilization of hydrogenlike ions in intense laser pulses

L. N. Gaier and C. H. Keitel
Physical Review A 65, 023406 (2002)

1.63 Two-Loop QED Bound-State Calculations and Squared Decay Rates

U. D. Jentschura, C. H. Keitel, and K. Pachucki
Canadian Journal of Physics 80, 1213-1223 (2002)

1.62 Nuclear correlation in ionization and harmonic generation of H2+ in short intense laser pulses

W. Qu, Z. Chen, Z. Xu, and C. H. Keitel
Physical Review A 65, 013402 (2001)

1.61 Relativistic quantum optics

C. H. Keitel
Contemporary Physics 42, 353-363 (2001)

1.60 Narrow high-frequency spectral features via laser-induced slow spin flips

M. W. Walser and C. H. Keitel
Optics Communications 199, 447-451 (2001)

1.59 High-order regime of harmonic generation with two active electrons

J. Prager, S. Hu, and C. H. Keitel
Physical Review A 64, 045402 (2001)

1.58 Dynamics of multiply charged ions in intense laser fields

S. Hu and C. H. Keitel
Physical Review A 63, 053402 (2001)

1.57 Electron acceleration in combined laser and uniform electric fields

C. H. Keitel, Y. I. Salamin, and F. H. M. Faisal
Journal of Physics A: Mathematical and General 34, 2819-2837 (2001)

1.56 X-Ray Amplification by Laser Controlled Coherent Bremsstrahlung

K. Z. Hatsagortsyan and C. H. Keitel
Physical Review Letters 86, 2277-2280 (2001)

1.55 Geometric and Algebraic Approach to Classical Dynamics of a Particle with Spin

M. W. Walser and C. H. Keitel
Letters in Mathematical Physics 55, 63-70 (2001)

1.54 High Harmonic Generation Beyond the Electric Dipole Approximation

M. W. Walser, C. H. Keitel, A. Scrinzi, and T. Brabec
Physical Review Letters 85, 5082-5085 (2000)

1.53 Analysis of electron acceleration in a vacuum beat wave

Y. I. Salamin and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 33, 5057-5076 (2000)

1.52 Ground State Laser Cooling Using Electromagnetically Induced Transparency

G. Morigi, J. Eschner, and C. H. Keitel
Physical Review Letters 85, 4458-4461 (2000)

1.51 Exact analysis of ultrahigh laser-induced acceleration of electrons by cyclotron autoresonance

Y. I. Salamin, F. H. M. Faisal, and C. H. Keitel
Physical Review A 62, 053809 (2000)

1.50 Subcycle high electron acceleration by crossed laser beams

Y. I. Salamin and C. H. Keitel
Applied Physics Letters 77, 1082-1084 (2000)

1.49 Resonance fluorescence in intense laser fields

D. E. Browne and C. H. Keitel
Journal of Modern Optics 47, 1307-1337 (2000)

1.48 Coherent x-ray generation with laser driven ions

M. Casu, C. Szymanowski, S. Hu, and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 33, L411-L417 (2000)

1.47 Amplification without inversion in tailored vacua

M. Erhard and C. H. Keitel
Optics Communications 179, 517-523 (2000)

1.46 Spin-induced force in intense laser-electron interaction

M. W. Walser and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 33, L221-L225 (2000)

1.45 Magnetically induced ionization and rescatterings in intense laser fields

D. J. Urbach and C. H. Keitel
Physical Review A 61, 043409 (2000)

1.44 Spin Signatures in Intense Laser-Ion Interaction

S. Hu and C. H. Keitel
Physical Review Letters 83, 4709-4712 (1999)

1.43 Influence of spin-laser interaction on relativistic harmonic generation

M. W. Walser, C. Szymanowski, and C. H. Keitel
Europhysics Letter 48, 533-539 (1999)

1.42 Narrowing Spontaneous Emission without Intensity Reduction

C. H. Keitel
Physical Review Letters 83, 1307-1310 (1999)

1.41 Hollowing out single ions with high-power lasers

S. Hu and C. H. Keitel
Europhysics Letters 47, 318-323 (1999)

1.40 Influence of Zitterbewegung on Relativistic Harmonic Generation

C. Szymanowski, C. H. Keitel, and A. Maquet
Laser Physics 9, 133-137 (1999)

1.39 Total Fluorescence Inhibition via Incoherent Dressed Population Transfer

C. H. Keitel, S. Y. Zhu, and P. L. Knight
Laser Physics 9, 826-830 (1999)

1.38 Fluorescence control through multiple interference mechanisms

E. Paspalakis, C. H. Keitel, and P. L. Knight
Physical Review A 58, 4868-4877 (1998)

1.37 Radiative reaction in ultra-intense laser - atom interaction

C. H. Keitel, C. Szymanowski, P. L. Knight, and A. Maquet
Journal of Physics B: Atomic, Molecular and Optical Physics 31, L75-L83 (1998)

1.36 Exponential gain in resonant four-wave mixing via dressed inversions

C. H. Keitel
Physical Review A 57, 1412-1416 (1998)

1.35 Mott scattering in strong laser fields

C. Szymanowski, V. Véniard, R. Taieb, A. Maquet, and C. H. Keitel
Physical Review A 56, 3846-3859 (1997)

1.34 Intense laser - atom dynamics with the two-dimensional Dirac equation

C. H. Keitel, U. W. Rathe, M. Protopapas, and P. L. Knight
Journal of Physics B: Atomic, Molecular and Optical Physics 30, L531-L539 (1997)

1.33 Quantum interference effects in spontaneous atomic emission: Dependence of the resonance fluorescence spectrum on the phase of the driving field

M. A. Martinez, P. R. Herczfeld, C. Samuels, L. M. Narducci, and C. H. Keitel
Physical Review A 55, 4483-4491 (1997)

1.32 Strong intracavity and output laser noise reduction via initial atomic coherence

C. Saavedra, J. C. Retamal, and C. H. Keitel
Physical Review A 55, 3802-3812 (1997)

1.31 Atomic physics with super-high intensity lasers

M. Protopapas, C. H. Keitel, and P. L. Knight
Reports on Progress in Physics 60, 389-486 (1997)

1.30 The dressed state picture in quantum coherence and interference

C. H. Keitel, H. M. Doss, M. Fleischhauer, L. M. Narducci, M. O. Scully, and S. Y. Zhu
Zeitschrift für Naturforschung Section A : Journal of Physical Sciences 52, 114-116 (1997)

1.29 Phase of harmonics from strongly driven two-level atoms

F. I. Gauthey, C. H. Keitel, P. L. Knight, and A. Maquet
Physical Review A 55, 615-621 (1997)

1.28 Ultra-energetic electron ejection in relativistic atom - laser field interaction

C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 29, L873-L880 (1996)

1.27 Relativistic mass shift effects in adiabatic intense laser field stabilization of atoms

M. Protopapas, C. H. Keitel, and P. L. Knight
Journal of Physics B: Atomic, Molecular and Optical Physics 29, L591-L598 (1996)

1.26 Entropic measure of wave-packet spreading and ionization in laser-driven atoms

J. B. Watson, C. H. Keitel, P. L. Knight, and K. Burnett
Physical Review A 54, 729-735 (1996)

1.25 Recollisions, bremsstrahlung, and attosecond pulses from intense laser fields

M. Protopapas, D. G. Lappas, C. H. Keitel, and P. L. Knight
Physical Review A 53, R2933-R2936 (1996)

1.24 High harmonic generation in a static magnetic field

J. Connerade and C. H. Keitel
Physical Review A 53, 2748-2751 (1996)

1.23 Vacuum modified resonance fluorescence in intense laser fields

C. H. Keitel
Journal of Modern Optics 43, 1555-1562 (1996)

1.22 Role of electromagnetically induced transparency in resonant four-wave-mixing schemes

J. C. Petch, C. H. Keitel, P. L. Knight, and J. P. Marangos
Physical Review A 53, 543-561 (1996)

1.21 Quantum signatures in the stabilization dynamics

J. B. Watson, C. H. Keitel, P. L. Knight, and K. Burnett
Physical Review A 52, 4023-4028 (1995)

1.20 Resonance fluorescence in a tailored vacuum

C. H. Keitel, P. L. Knight, L. M. Narducci, and M. O. Scully
Optics Communications 118, 143-153 (1995)

1.19 Role of initial coherence in the generation of harmonics and sidebands from a strongly driven two-level atom

F. I. Gauthey, C. H. Keitel, P. L. Knight, and A. Maquet
Physical Review A 52, 525-540 (1995)

1.18 Sampling entropies and operational phase-space measurement. II. Detection of quantum coherences

V. Buzek, C. H. Keitel, and P. L. Knight
Physical Review A 51, 2594-2601 (1995)

1.17 Sampling entropies and operational phase-space measurement. I. General formalism

V. Buzek, C. H. Keitel, and P. L. Knight
Physical Review A 51, 2575-2593 (1995)

1.16 Monte Carlo classical simulations of ionization and harmonic generation in the relativistic domain

C. H. Keitel and P. L. Knight
Physical Review A 51, 1420-1430 (1995)

1.15 Origin of the sub-natural line-narrowing effect in resonance fluorescence

C. H. Keitel, L. M. Narducci, and M. O. Scully
Applied Physics B: Lasers and Optics 60, S153-S154 (1995)

1.14 Switching Between Rayleigh-like and Lorentzian Lineshapes of the Dispersion in Driven Two-level Atoms

C. Szymanowski, C. H. Keitel, B. J. Dalton, and P. L. Knight
Journal of Modern Optics 42, 985-1003 (1995)

1.13 Enhancing the index of refraction under convenient conditions

C. Szymanowski and C. H. Keitel
Journal of Physics B: Atomic, Molecular and Optical Physics 27, 5795-5812 (1994)

1.12 Relativistic High-Harmonic Generation

C. H. Keitel, P. L. King, and K. Burnett
Europhysics Letters 24, 539-544 (1993)

1.11 Two mechanisms for inversionless amplification in four-level atoms with Raman pumping

C. H. Keitel, O. A. Kocharovskaya, L. M. Narducci, M. O. Scully, S. Y. Zhu, and H. M. Doss
Physical Review A 48, 3196-3202 (1993)

1.10 Free-electron lasing without inversion by interference of momentum states

G. Kurizki, M. O. Scully, and C. H. Keitel
Physical Review Letters 70, 1433-1436 (1993)

1.9 Lasing without inversion: interference of radiatively broadened resonances in dressed atomic systems

M. Fleischhauer, C. H. Keitel, L. M. Narducci, M. O. Scully, S. Y. Zhu, and M. S. Zubairy
Optics Communications 94, 599-608 (1992)

1.8 Quantum theory of laser emission from driven three-level atoms

A. S. Manka, C. H. Keitel, S. Y. Zhu, M. Fleischhauer, L. M. Narducci, and M. O. Scully
Optics Communications 94, 174-182 (1992)

1.7 Resonantly enhanced refractive index without absorption via atomic coherence

M. Fleischhauer, C. H. Keitel, M. O. Scully, C. Su, B. T. Ulrich, and S. Y. Zhu
Physical Review A 46, 1468-1487 (1992)

1.6 On the information entropy of squeezed states and the entropic uncertainty relation

K. Wódkiewicz and C. H. Keitel
Physics Letters. A 167, 151-160 (1992)

1.5 Triggered superradiance

C. H. Keitel, M. O. Scully, and G. Süßmann
Physical Review A 45, 3242-3249 (1992)

1.4 Lasing without inversion in a simple model of a three-level laser with microwave coupling

H. Fearn, C. H. Keitel, M. O. Scully, and S. Y. Zhu
Optics Communications 87, 323-330 (1992)

1.3 Lasing without inversion and enhancement of the index of refraction via interference of incoherent pump processes

M. Fleischhauer, C. H. Keitel, M. O. Scully, and C. Su
Optics Communications 87, 109-114 (1992)

1.2 Physical origin of the gain in a four-level model of a Raman driven laser without inversion

L. M. Narducci, M. O. Scully, C. H. Keitel, S. Y. Zhu, and H. M. Doss
Optics Communications 86, 324-332 (1991)

1.1 A simple model of a laser without inversion

L. M. Narducci, H. M. Doss, P. Ru, M. O. Scully, S. Y. Zhu, and C. H. Keitel
Optics Communications 81, 379-384 (1991)

Invited papers (often non-refereed) in conference proceedings, books and journals

2.57 Real-time reconstruction of the strong-field driven dipole response

V. Stooß, S. M. Cavaletto, S. Donsa, A. Blaettermann, P. Birk, C. H. Keitel, I Brezinova, J. Burgdoerfer, C. Ott, and T. Pfeifer
Journal of Physics: Conference Series 1412, 092011 (2020)

2.56 Wie genau trennt sich ein Elektron vom Atom? 

C. H. Keitel
Physik Journal 18. Jg., 22-23 (2019)

2.55 Nonlinear quantum electrodynamics in ultra-high intensity laser-plasma interactions

F. Mackenroth, N. Kumar, A. Di Piazza, M. Tamburini, N. Neitz, and C. H. Keitel
Proceedings of SPIE 11039, 1103902 (2019)

2.54 Experimental Evidence for Wigner's Tunneling Time

N. Camus, E. Yakaboylu, L. Fechner, M. Klaiber, M. Laux, Y. Mi, K. Z. Hatsagortsyan, T. Pfeifer, C. H. Keitel, and R. Moshammer
Journal of Physics Conference Series 999, 012004 (2018)

2.53 The g factor of highly charged ions

Z. Harman, B. Sikora, V. A. Yerokhin, H. Cakir, V. Debierre, N. Michel, N. S. Oreshkina, N. Belov, J. Zatorski, and C. H. Keitel
Journal of Physics: Conference Series 1138, 012002 (2018)

2.52 Spin dynamics in relativistic light-matter interaction

H. Bauke, S. Ahrens, C. H. Keitel, and R. Grobe
Proceedings of SPIE 9515, 95150L (2015)

2.51 Laser-driven Thomson scattering for the generation of ultra-bright multi-MeV gamma-ray beams

G. Sarri, D. J. Corvan, J. M. Cole, W. Schumaker, A. Di Piazza, H. Ahmed, M. Yeung, Z. Zhao, C. Harvey, C. H. Keitel, K. Krushelnick, S. P. D. Mangles, Z. Najmudin, A. G. R. Thomas, and M. Zepf
Proceedings of SPIE 9514, 95140W (2015)

2.50 Particle beams in ultrastrong laser fields: direct laser acceleration and radiation reaction effects

Y. I. Salamin, J. Li, K. Z. Hatsagortsyan, M. Tamburini, A. Di Piazza, and C. H. Keitel
Institute of Physics Conference Series 594, 012018 (2015)

2.49 Fano Resonances in the Time Domain

A. Kaldun, C. Ott, V. Stooß, A. Fischer, A. Blättermann, T. Ding, P. Raith, K. Meyer, M. Laux, J. Evers, C. H. Keitel, C. H. Greene, and T. Pfeifer
Journal of Physics: Conference Series 635, 092079 (2015)

2.48 Novel aspects of radiation reaction in the classical and the quantum regime

N. Neitz, N. Kumar, K. F. Mackenroth, K. Z. Hatsagortsyan, C. H. Keitel, and A. Di Piazza
Journal of Physics: Conference Series 497, 012015 (2014)

2.47 The Potential Uses of X-Ray FELS in Nuclear Studies

W. Liao, C. H. Keitel, and A. Pálffy
FEL2013: Proceedings of the 35th International Free-Electron Laser Conference, 749-752 (2013)

2.46 Computational relativistic quantum dynamics and its application to relativistic tunneling and Kapitza-Dirac scattering

H. Bauke, M. Klaiber, E. Yakaboylu, K. Z. Hatsagortsyan, S. Ahrens, C. Müller, and C. H. Keitel
Proceedings of SPIE 8780, 87801Q, 1-9 (2013)

2.45 Die Quantenelektrodynamik auf den Prüfstand gestellt

S. Sturm, K. Blaum, Z. Harman, C. H. Keitel, F. Köhler, A. Wagner, and J. Zatorski
Jahrbuch der Max-Planck-Gesellschaft zur Förderung der Wissenschaften, 4358343 (2013)

2.44 Streaking at high energies with electrons and positrons

A. Ipp, J. Evers, C. H. Keitel, and K. Z. Hatsagortsyan
American Institute of Physics Conference Proceedings 1462, 25-30 (2012)

2.43 Frontiers of Atomic High-Harmonic Generation

M. C. Kohler, T. Pfeifer, K. Z. Hatsagortsyan, and C. H. Keitel
Advances in Atomic, Molecular, and Optical Physics 61, 159-208 (2012)

2.42 Electron correlation and interference effects in strong-field processes

M. C. Kohler, C. Müller, C. Buth, A.B. Voitkiv, K. Z. Hatsagortsyan, J. Ullrich, T. Pfeifer, and C. H. Keitel
Multiphoton Processes and Attosecond Physics 125, 209-217 (2012)

2.41 Higher order resonant intershell electronic recombination for highly charged ions

P. H. Mokler, C. Beilmann, S. Bernitt, Z. Harman, C. H. Keitel, O. Postavaru, J. Ullrich, and J.R. Crespo López-Urrutia
Journal of Physics: Conference Series 388, 062043 (2012)

2.40 Laserbeschleunigung von Ionen

Z. Harman, B. Galow, and C. H. Keitel
Jahrbuch der Max-Planck-Gesellschaft zur Förderung der Wissenschaften (2012)

2.39 Ultra-strong laser pulses: streak-camera for gamma-rays via pair production and quantum radiative reaction

K. Z. Hatsagortsyan, A. Ipp, J. Evers, A. Di Piazza, and C. H. Keitel
Proceedings of SPIE 8080, 80801T (2011)

2.38 QED and nuclear effects in strong optical and x-ray laser fields

A. Di Piazza, A. Pálffy, W. Liao, K. Z. Hatsagortsyan, and C. H. Keitel
Proceedings of SPIE 8075, 807505 (2011)

2.37 Radiation pressure and radiation reaction effects in laser-solid interaction

A. Macchi, M. Tamburini, S. Veghini, F. Pegoraro, A. Di Piazza, and C. H. Keitel
Proceedings of the SPIE 7994, 799421 (2011)

2.36 Strong-field QED in intense laser fields

F. Mackenroth, M. Ruf, B. J. King, A. Di Piazza, C. Müller, and C. H. Keitel
Proceedings of the SPIE 7994, 799422 (2011)

2.35 Science of Extreme Light Infrastructure

T. Tajima, B. C. Barish, C. P. Barty, S. Bulanov, P. Chen, J. Feldhaus, J. Hjdu, C. H. Keitel, J.-C. Kieffer, D.-K. Ko, W. Leemans, D. Normand, L. Palumbo, K. Rzazewski, A. Sergeev, Z.-M. Sheng, F. Takasaki, and M. Teshima
AIP Conference Proceedings 1228, 11-35 (2010)

2.34 Resonant recombination at ion storage rings: a conceptual alternative for isotope shift and hyperfine studies

C. Brandau, C. Kozhuharov, A. Mueller, D. Bernhardt, F. Bosch, D. Boutin, F. J. Currell, C. Dimopoulou, B. Franzke, S. Fritzsche, A. Gumberidze, Z. Harman, U. D. Jentschura, C. H. Keitel, Y. S. Kozhedub, R. Krücken, Y.. A. Litvinov, F. Nolden, B. O’Rourke, R. Reuschl, S. Schippers, V. M. Shabaev, U. Spillmann, Z. Stachura, M. Steck, T.. Stöhlker, I. I. Tupitsyn, D. F. A. Winters, and A. Wolf
Hyperfine Interactions 196, 115-127 (2010)

2.33 Light propagation : from atomic to nuclear quantum optics

J. Evers, R. Fleischhaker, A. Pálffy, and C. H. Keitel
Modern optics and photonics : atoms and structured media, 3-15 (2010)

2.32 Vacuum-induced processes in multi-level atoms

M. Kiffner, M. Macovei, J. Evers, and C. H. Keitel
Progress in Optics 55, 85-197 (2010)

2.31 Investigation of Vacuum Structure - Towards Schwinger Fields: QED effects and Particle Physics at ELI

A. Di Piazza, A. M. Fedotov, H. Gies, K. Z. Hatsagortsyan, T. Heinzl, A. Ilderton, C. H. Keitel, M. Marklund, S.D. Moustaizis, C. Müller, N.B. Narozhny, I. Ploumistakis, R. Schützhold, D. Symes, and I. Tsohantjis
Extreme Light Infrastructure : Report on the Grand Challenges Meeting, 17-42 (2009)

2.30 Photonuclear Physics - explore nuclei with photons

A. Bandrauk, C. P. Barty, D. Habs, C. H. Keitel, J. Schreiber, R. Schützhold, P. G. Thirolf, and H.A. Weidenmüller
Report on the results of the Grand Challenges Meeting, 68-91 (2009)

2.29 Particle physics at ELI

A. Di Piazza, H. Gies, K. Z. Hatsagortsyan, T. Heinzl, A. Ilderton, C. H. Keitel, M. Marklund, S.D. Moustaizis, C. Müller, N.B. Narozhny, I. Ploumistakis, R. Schützhold, D. Symes, and I. Tsohantjis
Extreme Light Infrastructure : Report on the Grand Challenges Meeting, 43-60 (2009)

2.28 Efficient Integration of Quantum Mechanical Wave Equations by Unitary Transforms

H. Bauke and C. H. Keitel
AIP Conference Proceedings 1148, 17-20 (2009)

2.27 Relativistic Quantum Dynamics in Intense Laser Fields

G. R. Mocken, Y. I. Salamin, and C. H. Keitel
(2009)

2.26 Correlated relativistic dynamics and nuclear effects in dielectronic and visible spectra of highly charged ions

Z. Harman, A. N. Artemyev, J. R. Crespo López-Urrutia, A. J. González Martínez, U. D. Jentschura, C. H. Keitel, V. Mäckel, R. Soria Orts, H. Tawara, I. I. Tupitsyn, J. Ullrich, and A. Volotka
(2008)

2.25 Breakdown of the few-level approximation in dipole-dipole interacting systems

M. Kiffner, J. Evers, and C. H. Keitel
Proceedings of SPIE 6603, 66030C (2007)

2.24 Vacuum fluctuations and nuclear quantum optics in strong laser pulses

A. Di Piazza, K. Z. Hatsagortsyan, J. Evers, and C. H. Keitel
Proceedings of SPIE 6603, 660305 (2007)

2.23 QED, nuclear and high-energy processes in extremely strong laser pulses

A. Di Piazza, C. Müller, J. Evers, K. Z. Hatsagortsyan, and C. H. Keitel
(2007)

2.22 Strong-field spatial interference in a tailored electromagnetic bath

M. Macovei, J. Evers, G. X. Li, and C. H. Keitel
Proceedings of III International Conference “Frontiers of Nonlinear Physics”, 189-190 (2007)

2.21 Quantum control of interacting multiatom systems

J. Evers, M. Kiffner, and C. H. Keitel
AIP Conference Proceedings 963,2, 756 (2007)

2.20 High-energy quantum dynamics in ultra-intense laser pulses

C. Müller, G. R. Mocken, K. Z. Hatsagortsyan, and C. H. Keitel
AIP Conference Proceedings 963,1, 552 (2007)

2.19 Correlation and quantum electrodynamic effects on the radiative lifetime and relativistic nuclear recoil in Ar13+ and Ar14+ ions

Z. Harman, U. D. Jentschura, C. H. Keitel, A. Lapierre, R. Soria Orts, J. R. Crespo López-Urrutia, H. Tawara, J. Ullrich, A. N. Artemyev, I. I. Tupitsyn, A. V. Volotka, and V. M. Shabaev
Journal of Physics: Conference Series 58, 024 (2007)

2.18 Harmonic generation from laser-driven vacuum

A. Di Piazza, K. Z. Hatsagortsyan, and C. H. Keitel
AIP Conference Proceedings 827, 436 (2006)

2.17 Nonperturbative multiphoton processes and electron-positron pair production

K. Z. Hatsagortsyan, C. Müller, and C. H. Keitel
AIP Conference Proceedings 827, 442 (2006)

2.16 QED Corrections to the Dynamic Polarizability

M. Haas, U. D. Jentschura, and C. H. Keitel
AIP Conference Proceedings 796, 317 (2005)

2.15 Vacuum-mediated incoherent processes in coherently prepared media

J. Evers, U. D. Jentschura, M. Macovei, and C. H. Keitel
Proceedings of SPIE 5842, 241-255 (2005)

2.14 Quantum dynamics beyond the dipole approximation: From two-electron ions to more complex systems

A. Staudt, G. R. Mocken, M. Haas, and C. H. Keitel
(2004)

2.13 Net electron energy gain from a tightly-focused laser beam in vacuum

Y. I. Salamin and C. H. Keitel
AIP Conference Proceedings 697, 3-12 (2003)

2.12 Narrow Spectral Features in Resonance Fluorescence in Laser-Driven Atomic Few-Level Systems

J. Evers and C. H. Keitel
Interactions in ultracold gases: from atoms to molecules, 388-390 (2003)

2.11 Single and Crystalized Ions in Ultra-Intense Laser Pulses

K. Z. Hatsagortsyan, U. D. Jentschura, and C. H. Keitel
AIP Conference Proceedings 634, 71-78 (2002)

2.10 Relativistic laser-particle interaction: From single electrons to multi-particle systems

G. R. Mocken, Y. I. Salamin, K. Z. Hatsagortsyan, and C. H. Keitel
AIP Conference Proceedings 611, 44 (2002)

2.9 Electrons and Ions in relativistic Laser Fields

Y. I. Salamin, M. W. Walser, S. Hu, and C. H. Keitel
Atoms, solids, and plasmas in super-intense laser fields : [proceedings of the 30th Course of the International School of Quantum Electronics on Atoms, Solids and Plasmas in Super-Intense Laser Fields, held at the Ettore Majorana International Centre for Scientific Culture in July 8-14, 2000, in Erice, Sicily, Italy], 273-284 (2001)

2.8 Control of optical properties of materials by atomic coherence and quantum interference effects

M. A. Martinez, P. R. Herzfeld, L. M. Narducci, Samuels C., and C. H. Keitel
SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC) : Proceedings, 239-244 (1997)

2.7 Subnatural linewidth in large optical fields

L. M. Narducci, C. H. Keitel, G. Oppo, and M. O. Scully
AIP Conference Proceedings 328, 251 (1995)

2.6 Super-Intense field physics: What is classical and what is quantum?

J. B. Watson, C. H. Keitel, P. L. Knight, and K. Burnett
Annual Report 1994-95, TR-95-025, Central Laser Facilities, Rutherford Appleton Laboratory (1995)

2.5 Lasing without inversion: More gain for less pain

C. H. Keitel and P. L. Knight
Opto & Laser Europe 7, 39-43 (1993)

2.4 Measuring information via Glauber's Q-representation

C. H. Keitel and K. Wodkiewicz
(1993)

2.3 Enhancing the index of refraction without absorption: Phaseonium versus a mixture of two-level atoms

M. O. Scully, T. W. Hänsch, M. Fleischhauer, C. H. Keitel, and S. Y. Zhu
Physics and probability : essays in honor of Edwin T. Jaynes, 73-80 (1993)

2.2 Sub-natural linewidth and other coherent phenomena in driven multilevel systems

L. M. Narducci, M. O. Scully, C. H. Keitel, S. Y. Zhu, H. M. Doss, A. S. Manka, and G. L. Oppo
Proceedings of the International Conference on Lasers '91 (1992)

2.1 Atomic coherence via quantum interference of incoherent processes

M. Fleischhauer and C. H. Keitel
Santa Fe Workshop Foundations of Quantum Mechanics, 342-348 (1992)