Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 3: XUV/X-ray spectroscopy I
A 3.6: Vortrag
Montag, 6. März 2017, 16:00–16:15, N 2
Relativistic calculations of the non-resonant two-photon K-shell ionization of neutral atoms — •Jiri Hofbrucker1,2, Andrey Volotka1,3, and Stephan Fritzsche1,2 — 1Helmholtz-Institut Jena, Germany — 2Friedrich-Schiller-Universität, Jena, Germany — 3St. Petersburg State University, Russia
The non-resonant two-photon one-electron K-shell ionization of neutral atoms is studied within the framework of relativistic second-order perturbation theory and independent particle approximation. The importance of relativistic and screening effects in the total as well as differential cross sections is investigated. Our results show that, at near two-photon ionization threshold energies, the account for the screening effects of the remaining electrons leads to occurrence of an unexpected minimum in the total two-photon ionization cross section [1] and to elliptical dichroism in the photoelectron angular distribution. For ionization of heavy atoms, relativistic effects result in a significant decrease of the total cross section [2], and in distortion of the angular distribution into forward direction.
[1]J. Hofbrucker, A. V. Volotka, S. Fritzsche, accepted in Phys. Rev. A.
[2]J. Hofbrucker, A. V. Volotka, S. Fritzsche, submitted to Nucl. Instr. Meth. Phys. Res.