Abstract
The triply differential cross section for electron impact ionization of hydrogen has been calculated in higher order starting from a formulation of Brauner et al. (1989). The short range effects missing from a first order calculation are included by using a Sturmian representation for the full Green function. The complexity of the calculation necessitated some simplification of the wavefunction. The authors find that, at 17.6 eV and 27.2 eV incident energies, the higher order corrections cause up to an order of magnitude increase in the cross section, but do not improve the shape compared to first order.
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