Charge transfer in collisions between protons and lithium atoms

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Abstract
Electron capture by protons from the L and K shells of Li atoms is studied in a wide energy range 0.6-400 keV (lab) using two-centre atomic orbital expansions with translational factors within the impact parameter formalism and the effective potential approximation to the electric field in the lithium atom. A review of available theoretical and experimental data given in the paper indicates that cross sections for capture from the L shell are generally in good agreement with calculations by methods employing different types of expansions. It is confirmed that capture into the n=2 shell of hydrogen dominates at energies up to 10 keV (lab). Cross sections for capture from the K shell are found to be relatively small for energies lower than 150-200 keV (lab). The latter conclusion is in agreement with an interpretation of the old measurements of Il'in et al. but disagrees with recent classical Monte-Carlo estimates of Olson.

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