The authors present a survey of the photoionization cross sections and photoelectron angular distributions for the outer $p$ subshell of the chalcogen atoms O, S, Se, and Te and the halogen atoms F, Cl, Br, and I. Results are presented in the Hartree-Fock approximation as well as in the central-potential-model approximation. An extensive analysis and comparison of the results obtained is presented which finds that exchange-interaction effects are strongest for the $n=3\mathrm{}$ row elements.

• Received 29 March 1979

DOI:https://doi.org/10.1103/PhysRevA.20.1005