Calculation of anisotropic photoionization cross sections. I. Hydrogen atom

Abstract

The differential and total cross sections of photoionization of the hydrogen atom from the states 1s, 2s, 2pm, 3pm, 3dm, and 4dm are calculated for the photoelectron kinetic energy E from E = 0.01 atomic unit to E = 2.00 atomic unit. It is found that when the magnetic sublevels of the initial state are equally populated, the angular distribution of photoelectrons has the behavior[Formula: see text]and, besides 1s and 2s states, the angular distribution of photoelectrons from np state, nd state, etc. will become isotropic at a particular photoelectron kinetic energy. The angular distribution of photoelectrons for the case in which the magnetic sublevels of the initial bound state are unequally populated is also discussed.