Impact-Parameter Calculation of Electron Capture in CloseH+-He Collisions

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Abstract
The impact-parameter method is used to calculate the electron-capture probability for proton-helium collisions at kilovolt energies. A two-state, atomic eigenfunction expansion is used, and distortion, back coupling, and momentum transfer are taken into account. The results are compared with the experimental data of Helbig and Everhart. Good agreement is obtained for energies above about 10 keV; at lower energies the agreement is poor. The neglect of either distortion or momentum transfer is shown to destroy even qualitative agreement between theory and experiment.