On the effect of the helium ground state wave function on the electron impact triple differential ionization cross section in asymmetric geometry

Abstract

The sensitivity of the triple differential cross sections for the electron impact ionization of helium to the target ground state wave function is investigated at high energies in the asymmetric Ehrhardt geometry. The calculation is done in the modified Glauber approximation using (i) one-parameter Hartree wave function and (ii) three-parameter analytical fit of Byron and Joachain to the Hartree–Fock wave function for the helium ground state. The latter choice leads to somewhat better agreement with the recent absolute data of Jung et al. at 600 eV incident energy. The results are however not very sensitive to this choice.