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A theoretical description of transitions in electron-atom and heavy-particle collisions (with and without rearrangement) at intermediate energies is developed. The associated T matrices involve the solution of an integral equation describing elastic scattering by fixed centres. The solution, once determined, can be used to examine the full array of transitions for any given system. An effectively exact description of e, H + -H(n) collisions, is proposed. With certain simplifying assumptions the multiple scattering problem by fixed centres is solved, thereby providing a useful description of A-H(n) collisions. Various approximate schemes capable of systematic improvement are constructed. The approach can also be applied to ionization problems.
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M. R. Flannery (1975) studied this question.
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