  Total cross sections for electron capture are calculated for collisions of
fast protons and alpha-particles with atomic hydrogen. The distorted- wave
impulse approximation is applied over the energy range 10-1500 keV/u.
State-selective results are given for the 1s, 2s and 2p levels. Both the 'post'
and 'prior' forms of the model are calculated and compared with results from
other theories and experimental measurements. In general the model performs
very well in comparison with experiment over this energy range though
discrepancies arise at lower energies.

Atomic Physics