Photoelectron angular distributions, cross sections, and branching ratios for atomic oxygen

Authors

Anthony F. Starace, University of Nebraska-LincolnFollow
Steven T. Manson, Georgia State University, Atlanta, Georgia
David J. Kennedy, Georgia Institute of Technology, Atlanta, Georgia

Date of this Version

June 1974

Comments

Published by American Physical Society. Phys. Rev. A 9, 2453 (1974). http://pra.aps.org. Copyright © 1974 American Physical Society. Permission to use.

Abstract

Theoretical calculations of the angular distribution of photoelectrons ejected from the 2p subshell of atomic oxygen for photoelectron kinetic energies 0≤ε≤30 Ry are presented using both Hartree-Fock (HF) and Herman-Skillman (HS) wave functions. Owing to the weakness of anisotropic electron-ion interactions, as evidenced by small differences between HF photoelectron phase shifts for alternative outgoing channels, the simple HS calculation of the angular-distribution asymmetry parameter is found to agree to within ≲ 0.1 with the HF calculations. Photoionization cross sections and photoelectron branching ratios have also beem computed in both the HF and HS approximation for the 2p subshell of atomic oxygen in the wavelength range 910≤λ≤100 ÅA. Comparison is made with other theoretical calculations and with the experimental branching-ratio measurements of Samson and Petrosky at λ=584.3 ÅA.