Electron impact excitation of H and He+. III. 1s to np transitions

Abstract

For pt.II see abstr. A47878 of 1974. The distorted wave polarized orbital models described previously are used to calculate total and differential cross sections for 1s to np (n-2,3,4) transitions in H and He+. The calculated total 2p cross sections agree with experiment within +or-10% at all energies above 20 eV. Differential cross sections for total n=2 excitation are in good agreement with experiment at 50 eV and angles below 60 degrees . The predictions for 90 degrees polarization of Ly alpha also agree closely with experiment for E>or=20 eV.