Abstract
The impulse approximation for capture of atomic K-shell electrons by incident protons is investigated with respect to a realistic treatment of the initial and intermediate states of the atomic target. Explicit evaluations are made in the single-electron picture described by an effective target potential of Yukawa type. When compared with corresponding results within the standard hydrogenic description, it is found that the effect of proper screening is similar to the effect of off-shell factors found in the strong-potential born approximation. Effort should therefore be directed towards a study of the combined effect in order to obtain a more complete understanding of the electron capture process.
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