Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 27: XUV/X-ray Science
A 27.8: Talk
Wednesday, March 7, 2018, 15:45–16:00, K 1.011
Comprehensive study of nondipole effects in photoionization of the He 1s and Ne 2s shells — •Ticia Buhr1, Levente Abrok2, Akos Köver2, Beatrix Pollakowski-Herrmann3, Jan Weser3, Jan Dreismann1, David Nagy2, Daniel Paul1, Dezso Varga2, Alfred Müller1, Burkhard Beckhoff3, Stefan Schippers1, and Sandor Ricz2 — 1Justus-Liebig-Universität Gießen, Gießen — 2Institute for Nuclear Research, Hungarian Academy of Sciences, Debrecen, Hungary — 3Physikalisch-Technische Bundesanstalt, Berlin
Nondipole effects strongly modify the polar and azimuth 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 azimuth angles covering a solid angle of about 2π. The experiments were carried out at the beam line PTB-XRS of BESSY II using linearly polarized photons. The photoelectrons were detected with an ESA-22-type electrostatic electron spectrometer [2] in in-plane as well as in off-plane geometry determined by the photon momentum and polarization vectors. The observed disagreement between the experimental and theoretical angular distributions might be explained with the neglected terms in the calculations [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).