Abstract
The cross sections for the $2^{1}P$ excitation of He by electron impact have been calculated with the distorted-wave Born approximation (by Madison and Shelton) and with the plane-wave Born approximation (by Kim and Inokuti). Although the distorted-wave description of the incident electron results in greatly improved cross sections at large angles compared to the plane-wave method, this paper points out that a substantial part [(35-80)%] of the difference in the two methods for small-angle scattering comes from using different He wave functions in the two computations.
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