Photon and electron ionisation of helium to the n =2 state of He'

Abstract

Partial photoionisation cross sections, the ratios of partial cross sections and anisotropy parameters in the angular distributions of photoelectrons are calculated in the region between the second and third ionisation thresholds of helium with the inclusion of all configuration interactions for a limited number of states of the subspaces of open and closed channels. The generalised partial oscillator strengths for transitions to the continuum of helium are calculated in the same approximation. The results are compared with experiment and calculations of different authors.