Abstract
Cross sections for the ionization of neutral helium by electron impact are calculated in two versions of the Born approximation and in the Born exchange approximation, using accurate atomic wave functions. The effect of exchange in the Born exchange approximation is to remove more than half of the discrepancy between the conventional Born (Born (a)) cross sections and the experimental values of Smith. The Born (b) approximation, which is consistent with the Pauli principle, gives results intermediate between the other two. The calculated energy and velocity distributions conflict with previous Born (a) determinations.
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