1.7k citations · 13.7k across the 342 of their papers we have counts for
130 papers · 1 filter
Time delay in nonadiabatic tunneling ionization
Michael Klaiber, Karen Z. Hatsagortsyan, Christoph H. Keitel
The under-the-barrier recollision pathway during the tunneling ionization of an atom, despite its minuscule amplitude, leaves its signature on the observable photoelectron momentum…
Qprop-ND: A Nondipole Extension of the Qprop Package for Strong-Field Laser Physics
Haoyuan He, Zhao-Han Zhang, Karen Z. Hatsagortsyan +1
The Qprop 3.0 package for the solution of the time-dependent Schrödinger equation for an electron in a laser field and atomic potential is extended to incorporate nondipole effects…
Nondipole Coulomb effects in strong x-ray field ionization
Haoyuan He, Karen Z. Hatsagortsyan, Christoph H. Keitel
Atomic ionization in superintense x-ray fields is studied through numerical solutions of the time-dependent Schrödinger equation including nondipole corrections. The role of the Co…
Higher-order corrections to the field shift in atomic systems
V. A. Yerokhin, Z. Harman, C. H. Keitel
Differences in nuclear charge distributions between isotopes lead to small changes in atomic spectra known as the field shift. While largely proportional to the change in the mean-…
Wichmann-Kroll Correction to the Interelectronic Interaction in He- and Li-Like Ions
J. Sommerfeldt, V. A. Yerokhin, Z. Harman +1
We present a theoretical study of the higher-order QED contribution to the interelectronic interaction in He- and Li-like ions, where a virtual electron-positron loop is inserted i…
Quasiperiodic nondipole ionization dynamics in the x-ray stabilization regime
Aleksandr V. Boitsov, Karen Z. Hatsagortsyan, Christoph H. Keitel
Recent advances in strong x-ray laser techniques enable the study of nonlinear multiphoton ionization in extreme high-frequency fields. Although the stabilization regime in such fi…