Abstract
The angular distribution of the Xe $5s$ photoelectrons was measured in the 90--225 eV photon energy range using linearly polarized synchrotron radiation. The experimentally determined angular distribution parameters were compared with theoretical values obtained from calculations based on the random-phase approximation and the time-dependent density-functional theory. Experiment shows that the dipole (\ensuremath{\beta}) and nondipole (\ensuremath{\gamma}) parameters vary strongly as a function of the photon energy, in accordance with calculations that account for the interchannel coupling. Nondipole effects observed clearly in experiment confirm the role of multielectron correlation in describing the $5s$ photoionization of Xe far from the ionization threshold.
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