For pt.III, see abstr. A7079 of 1973. The long-range nature of the Coulomb potential is taken into account in the derivation of a distorted T-matrix. When applied to elastic electron-hydrogen collisions the results are considerably better than those previously presented and compare favourably with the eikonal approximation to the second order Faddeev-Watson expansion.
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M J Roberts (1974) studied this question.
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