Triple differential cross section for electron impact ionisation of the hydrogen atom

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Abstract
The triple differential cross section for electron impact ionisation of the ground state is calculated for atomic hydrogen in the Born, Coulomb-projected Born (CPB) and generalised Coulomb-projected Born (GCPB) approximations including exchange. The present CPB calculation is in agreement with the earlier calculation of Geltman and Hidalgo (1974). The authors have compared the present results with the experimental data of Weigold et al (1973) on the angular correlation of the scattered and ejected electrons. The CPB and GCPB calculations are in fairly good qualitative agreement with the shape of the experimental five-fold differential cross section (often called the triple differential cross section) for atomic hydrogen.