Large nondipole correlation effects near atomic photoionization thresholds
M. Ya. AmusiaA. F. Ioffe Physical-Technical Institute, St. Petersburg 194021, RussiaA. S. BaltenkovArifov Institute of Electronics, Akademgorodok, 700143 Tashkent, Republic of UzbekistanZ. FelfliDepartment of Physics and Center for Theoretical Studies of Physical Systems, Clark Atlanta University, Atlanta, Georgia 30314A. Z. MsezaneDepartment of Physics and Center for Theoretical Studies of Physical Systems, Clark Atlanta University, Atlanta, Georgia 30314
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The parameter that determines the nondipole correction to the angular distribution is calculated for Ar $1s$ and $3s$ subshells in the Hartree-Fock (HF) approximation and taking account of the multielectron correlations, using the random-phase approximation with exchange. In the photoelectron energy range 0--100 eV the parameter, which for s subshells is nonzero at threshold, is found for Ar $3s$ to be strongly affected by multielectron correlations. Results are also presented for He and Be in the HF approximation.
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