A phase-shift analysis of electron-helium scattering. II. Elastic scattering in the energy interval 100-500 eV

Abstract

For pt. I see abstr. A14178 of 1970. Using the most recent cross section data, the authors calculate from a dispersion relation, the real part of the forward elastic scattering amplitude for electron-helium scattering. The calculated differential cross section in the forward direction is compared with that obtained by extrapolating to zero angle the recent absolute measurements of the differential cross sections by Bromberg and by Vriens et al. It is concluded that within the errors associated with the calculated and experimental quantities the measured cross sections are consistent with the assumed dispersion relation. It is shown that theoretical estimates of the scattering amplitude by the extended polarized orbital method are in error at small angles of scattering.