Christoph Helmut Keitel

1.448High-accuracy measurements of core-excited transitions in light Li-like ions

M. Togawa, S. Kühn, C. Shah, V. A. Zaytsev, N. S. Oreshkina, J. Buck, S. Bernitt, R. Steinbrügge, J. Seltmann, M. Hoesch, C. H. Keitel, T. Pfeifer, M. A. Leutenegger, and J. R. Crespo López-Urrutia
Physical Review A 110, L030802 (2024)

1.447Precision spectroscopy on ⁹Be overcomes limitations from nuclear structure

S. Dickopf, B. Sikora, A. Kaiser, M. Müller, S. Ulmer, V. A. Yerokhin, Z. Harman, C. H. Keitel, A. Mooser, and K. Blaum
Nature 632, 757-761 (2024)
 MPIK press release: Through the spaceship atom's shield
 MPIK-Pressemitteilung: Durch den Schutzschild des Raumschiffs Atom
 idw press release: Through the spaceship atom's shield
 Publisher Correction

1.446Generalized analytical description of relativistic strong-field ionization

M. Klaiber, K. Z. Hatsagortsyan, and C. H. Keitel
Physical Review A 110, 023103 (2024)

1.445Efficient production of ^229mTh via nuclear excitation by electron capture

J. Zhao, A. Pálffy, C. H. Keitel, and Y. Wu
Physical Review C 110, 014330 (2024)

1.444Fermionic signal of vacuum polarization in strong laser fields

Y. Dai, K. Z. Hatsagortsyan, C. H. Keitel, and Y. Chen
Physical Review D 110, 012008 (2024)

1.443Challenging beyond-the-standard-model solutions to the fine-structure anomaly in heavy muonic atoms

K. A. Beyer, I. A. Valuev, C. H. Keitel, M. Tamburini, and N. S. Oreshkina
Physics Letters B 854, 138746 (2024)

1.442Penning-trap measurement of the Q value of electron capture in ¹⁶³Ho for the determination of the electron neutrino mass

C. Schweiger, M. Braß, V. Debierre, M. Door, H. Dorrer, C. E. Düllmann, C. Enss, P. Filianin, L. Gastaldo, Z. Harman, M. W. Haverkort, J. Herkenhoff, P. Indelicato, C. H. Keitel, K. Kromer, D. Lange, Y. N. Novikov, D. Renisch, A. Rischka, R. X. Schüssler, S. Eliseev, and K. Blaum
Nature Physics 20, 921-927 (2024)
 MPIK press release: Ghost particle on the scales
 MPIK-Pressemitteilung: Geisterteilchen auf der Waage
 Phys.org: Ghost particle on the scales: Research offers more precise determination of neutrino mass
 Science alert: Most Precise Measure Ever Brings Us Closer to Knowing The 'Ghost' Particle's True Mass
 Nature Physics research briefing: Mass difference measurements help to determine the neutrino mass

1.441Nonspreading relativistic electron wavepacket in a strong laser field

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

1.440Nuclear magnetic shielding in heliumlike ions

V. A. Yerokhin, K. Pachucki, Z. Harman, and C. H. Keitel
Physical Review A 109, 032808 (2024)

1.439Atomic 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)

1.438Electron 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

1.437Observation 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)
 MPIK press release: Towards the next-generation atomic clock
 MPIK-Pressemitteilung: Auf dem Weg zur Atomuhr der nächsten Generation

1.436Energy 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)

1.435Stringent 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

1.434Spin-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)

1.433Extreme 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)

1.432Laser-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)

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

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

1.430Certifying 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)

1.429Strong 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)

1.428Probing 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)

1.427All-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)

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

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

1.425Electron 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

1.424New 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

1.423Testing 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)

1.422Reconciling 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)
 see also: Physical Review Collection on Attosecond Science

1.421High-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

1.420Proportionality 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)

1.419Reply 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)

1.418Generation 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)

1.417Tunneling 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)

1.416Electron 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)

1.415Measurement 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

1.414Direct 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

1.413Evidence 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)

1.412Subcycle time-resolved nondipole dynamics in tunneling ionization

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

1.411Nondipole 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

1.410Spatiotemporal 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)

1.409Deciphering 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)

1.408Helicity 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)

1.407Parametric Mössbauer radiation source

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

1.406Dynamical 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)

1.405Nondipole 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)

1.404Quasimonoenergetic 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)

1.403High-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)

1.402Single 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)

1.401Observing 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)

1.400Photon 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)

1.399Retrieving 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)

1.398Metastable 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)

1.397Role 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)

1.396Two-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)

1.395Direct 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

1.394Transmutation of protons in a strong electromagnetic field

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

1.393Ultrarelativistic electrons in counterpropagating laser beams

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

1.392Relativistic 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)

1.391Construction 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)

1.390Two-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)

1.389Anomalous 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)

1.388Coherent 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“

1.387Extremely 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

1.386A Cosmic Zevatron Based on Cyclotron Auto-resonance

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

1.385Sub-barrier pathways to Freeman resonances

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

1.384High-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)

1.383Self-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)

1.382Interrogating 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)

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

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

1.380Ab 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)

1.379QED 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)

1.378Narrow-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)

1.377Structural 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)

1.376High 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)

1.375Skyrme-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)

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

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

1.373Measurement 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)

1.372Detection 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?

1.371Comment 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)

1.370Self-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)

1.369Mass-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)

1.368Electron 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)

1.367Polarized 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)

1.366Theory 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)

1.365X-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)

1.364Detection 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

1.363Ultrarelativistic 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)

1.362Polarized 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

1.361Roadmap 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)

1.360Holographic 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)

1.359g 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)

1.357Polarized 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

1.356Semiclassical 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)

1.355Polarized 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)

1.354Ultrarelativistic 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

1.353Nonlinear 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)

1.352Generation 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)

1.351Improved 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)

1.350Role 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)

1.349Determining 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)

1.348Resonance 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)

1.347Nonperturbative 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)

1.346Electron 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)

1.345High-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)

1.344Electron-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)

1.343Real-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)

1.342γ-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)

1.341Coulomb effect in laser-induced recollision excitation

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

1.340Implementing 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)

1.339Experimental 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

1.338Nuclear 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)

1.337Analytical 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)

1.336Analytical 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)

1.335Interplay 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)

1.334Giant 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

1.333Single-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)

1.332Tailoring 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)

1.331Probing 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)

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

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

1.329Improving 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)

1.328High-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)

1.327Analytic 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)

1.326Theoretical 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)

1.325Hyperfine 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)

1.324Spectral 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

1.323Laser-pulse-shape control of seeded QED cascades

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

1.322Experimental 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?

1.321Extraction 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)

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

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

1.319Deterministic strong-field quantum control

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

1.318Spin-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)

1.317Strong-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)

1.316Journeys 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)

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

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

1.314Identifying the Stern-Gerlach force of classical electron dynamics

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

1.313Virtual-detector approach to tunnel ionization and tunneling times

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

1.312Weighted 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)

1.311Multi-pair states in electron-positron pair creation

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

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

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

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

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

1.308X-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)

1.307Tailoring superradiance to design artificial quantum systems

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

1.306g 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

1.305Fields 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)

1.304Ionization 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)

1.303Bosonic 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)

1.301Regularization 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)

1.300Direct 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)

1.299Attosecond 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)

1.298Influence 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)

1.297Overview 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)

1.296Population inversion in two-level systems possessing permanent dipoles

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

1.295Phase 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)

1.294Feasibility 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)

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

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

1.292Nonlinear neutrino-photon interactions inside strong laser pulses

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

1.291Identifications of 5s_1/2−5p_3/2 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)

1.290Generation 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

1.289Identification 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)

1.288High-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)

1.287Relativistic tunneling picture of electron-positron pair creation

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

1.286Tunneling Dynamics in Multiphoton Ionization and Attoclock Calibration

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

1.285Ion Acceleration by Short Chirped Laser Pulses

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

1.284Polarization-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)

1.283Ultrahigh 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)

1.282Particle production reactions in laser-boosted lepton collisions

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

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

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

1.280Electron-spin dynamics induced by photon spins

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

1.279Astrophysical 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

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

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

1.277Generation 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)

1.276Robust 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)

1.275Plasma-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)

1.274Broadband 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

1.273Relativistic spin operators in various electromagnetic environments

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

1.272What is the relativistic spin operator?

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

1.271Quasiclassical 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)

1.270High-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

1.269Dominant 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

1.268Electron dynamics controlled via self-interaction

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

1.267Higgs boson creation in laser-boosted lepton collisions

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

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

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

1.265Relativistic 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)

1.264Major 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

1.263X-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)

1.262Laser-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)

1.261Nuclear-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)

1.260Coronium 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)

1.259Attosecond 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)

1.258Radiation-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)

1.257High-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)

1.256Quantum 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)

1.255Polarization operator for plane-wave background fields

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

1.254The 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)

1.253Nuclear 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)

1.252A 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

1.251A 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

1.250Lorentz 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

1.249Collapse-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)

1.248Under-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

1.247Interference-induced peak splitting in EUV superfluorescence

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

1.246X-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)

1.245Negative 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)

1.244Coherence-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)

1.243An 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

1.242Coherent 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

1.241Photon-photon scattering in collisions of laser pulses

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

1.240Cooperative 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)

1.239Extremely 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)

1.238Spin Dynamics in the Kapitza-Dirac Effect

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

1.237Laser 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)

1.236Optimization 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)

1.235Acceleration 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)

1.234Manipulating 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)

1.233Generation of correlated photon pairs in different frequency ranges

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

1.232QED 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)

1.231Nuclear 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)

1.230Coherent 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)

1.229Accelerating the Fourier split operator method via graphics processing units

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

1.228Dense 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

1.227Nuclear coherent population transfer with x-ray laser pulses

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

1.226Prominent 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

1.225Time 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)

1.224QED 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)

1.223Streaking 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)

1.222g 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

1.221Relativistic 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)

1.220Higher-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)

1.219Coherent 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)

1.218Phase-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)

1.217Attochirp-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

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

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

1.215Radiation 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)

1.214High-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)

1.213Optimizing direct intense-field laser acceleration of ions

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

1.212Radiation 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)

1.211Intense high-quality medical proton beams via laser fields

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

1.210Quantum 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)

1.209High 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)

1.208Resonant 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

1.207Double-slit vacuum polarization effects in ultraintense laser fields

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

1.206Complete 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)

1.205Determining 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)

1.204Effect 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)

1.203Photoionization 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)

1.202Squeezing 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)

1.201Nonperturbative 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)

1.200A 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

1.199Quantum entanglement in dense multiqubit systems

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

1.198A 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)

1.197Isotope 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)

1.196Intershell 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)

1.195Laser-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)

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

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

1.193Yoctosecond 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

1.192Probing 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)

1.191Exotic 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)

1.190Relativistic 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)

1.189Single-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)

1.188Spontaneous emission interference in negative-refractive-index waveguides

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

1.187Canonical transforms and the efficient integration of quantum mechanical wave equations

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

1.186Strong 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)

1.185Laser-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)

1.184Lepton 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)

1.183Pair 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)

1.182Ionization Dynamics versus Laser Intensity in Laser-Driven Multiply Charged Ions

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

1.181Coulomb-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)

1.180Robust 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)

1.179Antimatter: Abundant positron production

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

1.178Correlated 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)

1.177Laser photon merging in proton laser collisions

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

1.176Laser 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)

1.173Photon 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)

1.172Laser-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)

1.171FFT-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)

1.170Direct 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

1.169Photoemission 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)

1.168Electric-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)

1.167Spatially 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)

1.166High-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)

1.164Isotope 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)

1.161Nonperturbative vacuum-polarization effects in proton-laser collisions

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

1.160Zeeman splitting and g factor of the 1s²2s²2p ²P_3/2 and ²P_1/2 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)

1.159Isomer triggering via nuclear excitation by electron capture

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

1.158Photon splitting in a laser field

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

1.157Breakdown of the few-level approximation in collective systems

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

1.156Nuclear 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)

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

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

1.154Fully relativistic laser-induced ionization and recollision processes

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

1.153Electron 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)

1.152Laser-assisted bremsstrahlung for circular and linear polarization

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

1.151Nonlinear interaction of strong laser fields in vacuum

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

1.150Strongly 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)

1.149Enhancement of vacuum polarization effects in a plasma

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

1.148Refocussed relativistic recollisions

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

1.147Two-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)

1.146Coherent 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)

1.145Localization of atomic ensembles via superfluorescence

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

1.144Impact 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)

1.143Relativistic 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)

1.142Relativistic 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)

1.141Strong-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)

1.140Nonsequential double recombination in intense laser fields

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

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

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

1.138Enhanced 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)

1.137Laser-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)

1.136Relativistic ionization rescattering with tailored laser pulses

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

1.135Photoionization 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)

1.134Muon 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)

1.133Dynamic nuclear Stark shift in superintense laser fields

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

1.132Enhanced 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)

1.131Exploring 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)

1.130Microscopic laser-driven high-energy colliders

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

1.129Light 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)

1.128Controlling multiparticle correlations with a strong laser field

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

1.127Collective coherent population trapping in a thermal field

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

1.126Interference in the resonance fluorescence of two incoherently coupled transitions

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

1.125Polarization-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)

1.124Gauge-invariant relativistic strong-field approximation

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

1.123Benchmarking 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)

1.122Benchmarking 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)

1.121Two-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)

1.120Two-electron ionization and stabilization beyond the dipole approximation

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

1.119Nuclear Quantum Optics with X-Ray Laser Pulses

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

1.118Quantum Interference Enforced by Time-Energy Complementarity

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

1.117Relativistic high-power laser–matter interactions

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

1.116Geometry-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)

1.115Ionization 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)

1.114Comparison 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)

1.113Quantum correlations of an atomic ensemble via an incoherent bath

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

1.112Laser-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)

1.111Relativistic electron correlation, quantum electrodynamics and the lifetime of the 1s²2s²2p ²P°_3/2 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)

1.110Rapid 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)

1.109Harmonic generation from laser-driven vacuum

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

1.108Free-electron quantum signatures in intense laser fields

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

1.107Thin 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)

1.106Low-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)

1.105Above-threshold ionization beyond the dipole approximation

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

1.104Coherent manipulation of collective three-level systems

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

1.103Multiphoton quantum interference on a dipole-forbidden transition

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

1.102Radiation spectra of laser-driven quantum relativistic electrons

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

1.101Relativistic 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)

1.100Analytical 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)

1.98Relativistic and radiative corrections to the Mollow spectrum

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

1.97Magnetic and thermal influences on collective resonance fluorescence

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

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

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

1.95Spontaneous-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)

1.94Bound 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)

1.93Positronium in Intense Laser Fields

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

1.92New 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)

1.91Quantum dynamics of relativistic electrons

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

1.90Simulation 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)

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

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

1.88Lamb Shift of Laser-Dressed Atomic States

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

1.87Phase Control of Collective Quantum Dynamics

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

1.86Quantum Signatures in Laser-Driven Relativistic Multiple Scattering

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

1.85Laser Control of Collective Spontaneous Emission

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

1.84Stabilization 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)

1.83Quasi-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)

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

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

1.80Relativistic 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)

1.78Modifying spontaneous emission via interferences from incoherent pump fields

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

1.77Electron 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)

1.76Spontaneous-Emission Suppression on Arbitrary Atomic Transitions

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

1.75Inhibiting decoherence via ancilla processes

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

1.74A 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)

1.73Dark 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)

1.72Resonant multiphoton X-ray optics with highly charged ions

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

1.71Phase-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)

1.70Spin 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)

1.69Arbitrated quantum-signature scheme

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

1.68Laser-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)

1.67Electron Acceleration by a Tightly Focused Laser Beam

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

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

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

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

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

1.64Relativistic 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)

1.63Two-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)

1.62Nuclear 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)

1.61Relativistic quantum optics

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

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

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

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

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

1.58Dynamics of multiply charged ions in intense laser fields

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

1.57Electron 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)

1.56X-Ray Amplification by Laser Controlled Coherent Bremsstrahlung

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

1.55Geometric 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)

1.54High 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)

1.53Analysis 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)

1.52Ground State Laser Cooling Using Electromagnetically Induced Transparency

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

1.51Exact 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)

1.50Subcycle high electron acceleration by crossed laser beams

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

1.49Resonance fluorescence in intense laser fields

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

1.48Coherent 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)

1.47Amplification without inversion in tailored vacua

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

1.46Spin-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)

1.45Magnetically induced ionization and rescatterings in intense laser fields

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

1.44Spin Signatures in Intense Laser-Ion Interaction

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

1.43Influence of spin-laser interaction on relativistic harmonic generation

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

1.42Narrowing Spontaneous Emission without Intensity Reduction

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

1.41Hollowing 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)

1.39Total Fluorescence Inhibition via Incoherent Dressed Population Transfer

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

1.38Fluorescence control through multiple interference mechanisms

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

1.37Radiative 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)

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

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

1.35Mott scattering in strong laser fields

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

1.34Intense 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)

1.33Quantum 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)

1.32Strong 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)

1.31Atomic physics with super-high intensity lasers

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

1.30The 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)

1.29Phase 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)

1.28Ultra-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)

1.27Relativistic 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)

1.26Entropic 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)

1.25Recollisions, 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)

1.24High harmonic generation in a static magnetic field

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

1.23Vacuum modified resonance fluorescence in intense laser fields

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

1.22Role 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)

1.21Quantum signatures in the stabilization dynamics

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

1.20Resonance fluorescence in a tailored vacuum

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

1.19Role 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)

1.18Sampling 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)

1.17Sampling 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)

1.16Monte 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)

1.14Switching 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)

1.13Enhancing 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)

1.12Relativistic High-Harmonic Generation

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

1.11Two 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)

1.10Free-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)

1.9Lasing 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)

1.8Quantum 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)

1.7Resonantly 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)

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

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

1.5Triggered superradiance

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

1.4Lasing 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)

1.3Lasing 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)

1.2Physical 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)

1.1A 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

2.57Real-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)

2.55Nonlinear 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)

2.54Experimental 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)

2.53The 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)

2.52Spin dynamics in relativistic light-matter interaction

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

2.51Laser-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)

2.50Particle 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)

2.49Fano 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)

2.48Novel 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)

2.47The 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)

2.46Computational 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)

2.45Die 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)

2.44Streaking 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)

2.43Frontiers 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)

2.42Electron 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)

2.41Higher 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)

2.40Laserbeschleunigung von Ionen

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

2.39Ultra-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)

2.38QED 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)

2.37Radiation 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)

2.36Strong-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)

2.35Science 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)

2.34Resonant 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)

2.33Vacuum-induced processes in multi-level atoms

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

2.32 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)

2.31Investigation 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)

2.29Particle 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)

2.28Efficient Integration of Quantum Mechanical Wave Equations by Unitary Transforms

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

2.27Relativistic 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)

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

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

2.24Vacuum 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)

2.23QED, 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)

2.21Quantum control of interacting multiatom systems

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

2.20High-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)

2.19Correlation 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)

2.18Nonperturbative multiphoton processes and electron-positron pair production

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

2.17Harmonic generation from laser-driven vacuum

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

2.16QED Corrections to the Dynamic Polarizability

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

2.15Vacuum-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)

2.13Net 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)

2.11Single 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)

2.10Relativistic 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)

2.8Control 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)

2.7Subnatural 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)

2.3Enhancing 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)