Superelastic electron scattering from metastable helium

Abstract

The angular dependence of electrons superelastically scattered from metastable (23S) helium has been measured for the first time at incident electron energies of 10 and 30 eV. For comparison purposes these distributions, which cover the angular range from 35 degrees to 125 degrees , have been normalized to the convergent close coupling calculation of Bray et al. (1994). We also compare the normalized angular distributions to first-order many-body theory and R-matrix calculations.