The wave formulation of the impulse approximation has been applied to the case of electron capture into the ground, 2s and 2p excited states of hydrogen in collisions between protons and alkali-metal atoms sodium, potassium, rubidium and caesium. The transition matrix elements have been numerically calculated and used to determine the differential and integral cross sections for charge transfer for incident energy varying between 50 and 500 keV. Wherever possible the results have been compared with other available results.

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