Asymmetry parameters in single ionization of He, Ne by XUV pulses

Abstract Fully differential cross-sections of single ionization of He and Ne atoms are studied by linearly polarized extreme ultraviolet (XUV) photons in the energy range of 22.1-43.7 eV, using a reaction microscope. Photoelectron angular distributions and the β asymmetry parameters for He 1s2 electrons prove the reliability of our experiment, and the β asymmetry parameters extracted from the angular distributions of Ne 2p6 electrons are obtained. By comparing with different theoretical calculations, it is found that the contribution of the electron correlation effect in Ne 2p6 single ionization becomes increasingly important as the incident photon energy increases, while the relativistic effect is relatively low in the whole incident energy range. Our experimental β asymmetry parameters may serve as a significant reference to test the most elaborated theories in the field. The datasets presented in this paper, including the photoelectron angular distributions and β asymmetry parameters, are openly available at
https://www.doi.org/10.57760/sciencedb.j00113.00073. (https://www.scidb.cn/s/q26jAf)