SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 10: Interaction with VUV and X-ray light
A 10.3: Poster
Dienstag, 21. September 2021, 16:30–18:30, P
Comprehensive investigation of nondipole effects in photoionization of the He 1s and Ne 2s shells — •Ticia Buhr1, Levente Ábrók2, Alfred Müller1, Stefan Schippers1, Ákos Kövér2, and Sándor Ricz2 — 1Justus-Liebig-Universität Gießen, Giessen, Germany — 2Institute for Nuclear Research, Debrecen, Hungary
Nondipole effects strongly modify the polar- and azimuthal-angle dependence of the double differential cross section of the photoelectron emission [1]. In order to study these effects in detail, angular distributions of He 1s and Ne 2s photoelectrons were measured over wide ranges of the polar and azimuthal angles covering a solid angle of about 2π at 100 eV and 200 eV photon energies using linearly polarized synchrotron radiation. The photoelectrons were detected with an ESA-22-type electrostatic electron spectrometer [2] in in-plane and in out-of-plane geometry as determined by the photon momentum and polarization vectors. The observed difference between the experimental and theoretical angular distributions might be explained by the neglected terms in the calculation [1].
[1] A. Derevianko et al., At. Data Nucl. Data Tables 73, 153 (1999).
[2] L. Ábrók et al., Nucl. Instrum. Methods B 369, 24 (2016).