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Abstract
The effect of multiple electron excitation on the threshold behavior of Xe 5s photoionization is studied using the multichannel multiconfiguration Dirac-Fock method with full account of relaxation. The inclusion of the ionization channels related to 5${\mathrm{p}}^{4}$5d ${\mathrm{J}}_{\mathrm{ion}=(1/2}$ excited states is found to change the single-excitation results drastically. Our cross section and asymmetry parameter \ensuremath{\beta} are in very good agreement with experiment. Calculation of the related satellite cross sections predicts a new type of satellite that exists only in the near-threshold region and has a peculiar angular dependence.
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