Ab initio theoretical calculations are presented for the cross section, angular distribution, and spin polarization of photoelectrons for the $5s$ subshell of xenon. Starting from an initial basis of nonrelativistic Hartree-Fock wave functions, the authors treat the effect of final-state spin-orbit interaction in the Breit-Pauli approximation exactly. Electrostatic correlations between the $5s$ and $5p$ subshells are also included. Good agreement is obtained with experiment in the case of the photoionization cross section, but only qualitative agreement with experiment and with other theoretical calculations is obtained in the case of the photoelectron angular distribution due to the difficulty of obtaining accurate values for forbidden transition intensities starting from a nonrelativistic basis set. Spin polarization of as much as 20% is predicted near the $5s$-subshell cross section minimum. Finally, some effects of the large discrepancies between Hartree-Fock and Dirac-Fock subshell binding energies and the corresponding experimental values are discussed.

• Received 16 October 1979

DOI:https://doi.org/10.1103/PhysRevA.21.697