Polarisation and exchange effects on elastic scattering of electrons from helium

Abstract

The authors examine the effects of the polarisation potential and of local exchange potentials in the adiabatic exchange approximation for low-energy elastic scattering of electrons from helium atoms. They conclude that the most reliable results are obtained by including only the dipole part of the polarisation potential and by treating exchange exactly. They present detailed results for phaseshifts, differential, total elastic and momentum transfer cross sections. These agree well with other calculations and with experimental measurements. Show more