Abstract
The photoionization (PI) of the Xe atom was investigated in the vicinity of the $5s$-shell threshold by photon-induced fluorescence spectroscopy. The highest resolution so far attained of 2 meV enabled us to observe a new series of resonance structures in the $5s$-PI cross section closely above threshold. Calculations of the partial $5s$- and $5p$-PI cross sections were performed taking into account many-electron correlations. These structures were related with strongly delocalized $f$-resonances which affect the $5s$-PI cross section due to their mixing with $p$-resonances.
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