Abstract
High-resolution photoelectron spectra of xenon (Xe) were measured in the $4p$ photoionization region. The anisotropy parameters \ensuremath{\beta} were obtained for several photoelectron peaks with angle-resolved photoelectron measurements. The various complicated spectral features were observed due to the perturbed $4{p}^{\ensuremath{-}1}$ spin-orbit doublet and adjacent satellite structures. An analysis based on a relativistic multiconfiguration calculation has been carried out. The key role of the strong interactions between the $4{p}^{\ensuremath{-}1}$ core hole and the $4{d}^{\ensuremath{-}2}nl$ configurations has been investigated in detail. Experimental peak energies and intensities are in good agreement with theory. We find that the many of the complicated features are $4{d}^{\ensuremath{-}2}nl$ satellite lines, and their intensities are determined mostly by the amount of $4{p}^{\ensuremath{-}1}$ configurations that are mixed in. The experimental \ensuremath{\beta} values agree quite well with theory, indicating that the photoelectron angular distributions are also strongly influenced by the $4p$ direct-ionization contributions.
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