期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 48, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/48/12/124001
关键词
free-electron lasers; ab initio calculations; x-ray photoionization; above-threshold ionization
资金
- DAAD RISE program
- Deutsche Forschungsgemeinschaft [SFB 925]
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 with 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 1023 W cm(-2), two-photon above-threshold ionization of the K-shell electrons is as probable as one-photon ionization of the L-shell electrons.
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