Wave-packet propagation based calculation of above-threshold ionization in the x-ray regime

Abstract

We investigate the multi-photon process of above-threshold ionization for the light elements hydrogen, carbon, nitrogen and oxygen in the hard x-ray regime. Numerical challenges are discussed and by comparing Hartree-Fock-Slater calculations to configuration-interaction-singles results we justify the mean-field potential approach in this regime. We present a theoretical prediction of two-photon above-threshold-ionization cross sections for the mentioned elements. Moreover, we study how the importance of above-threshold ionization varies with intensity. We find that for carbon, at x-ray intensities around $10^{23}{\mathrm{Wcm}}^{-2}$, two-photon above-threshold ionization of the K-shell electrons is as probable as one-photon ionization of the L-shell electrons.

13 pages, 4 figures, 1 table

References in corpus (3)

• The Impact of Multichannel and Multipole Effects on the Cooper Minimum in the High-Harmonics Spectrum of Argon
• Calculation of photoelectron spectra within the time-dependent configuration interaction singles scheme
• Relativistic configuration-interaction calculation of $K\alpha$ transition energies in beryllium-like iron

Cited by in corpus (3)

• Nonlinear effects in photoionization over a broad photon-energy range within the TDCIS scheme
• Time-dependent configuration-interaction-singles calculation of the $5p$-subshell two-photon ionization cross section in xenon
• Spatio-temporal interference of photo electron wave packets and time scale of non-adiabatic transition in high-frequency regime