Abstract
The distorted-wave Born approximation (DWBA) is applied to the electron impact ionization of the ground state of hydrogen and a comparison is made between calculations of the triple differential cross section (TDCS) performed using the exact non-local exchange integral and a local potential exchange approximation. The exact exchange calculations are in slightly better agreement with experiment than the local exchange approximation calculations, retaining more structure as the energy approaches threshold. However the general conclusion of the earlier work is essentially unaltered - one needs to include both the effects of polarization in the incident channel and post-collisional Coulombic interactions between the three charged particles for a good agreement with experiment. Atomic units are used ħ = me = e = ao = 1.
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