The electron scattering cross sections by hydrogen in the 1s, 2s or 2p state have been computed on the basis of an approximation, which includes all coupling terms between these states but which excludes all others. Full account is taken of electron exchange. Results have been obtained at low energies of impact for those states of the system with low angular momentum. Comparison with earlier work indicates that the effect of coupling and exchange is very important.
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Burke et al. (1962) studied this question.
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