The resonance charge-transfer cross sections for the collision process He 2+ + H(1s) -> He + (2s, 2p) + H + have been evaluated in the atomic two-state and five-state approximations of the impact-parameter method. Momentum transfer was taken into account by the procedure described by Cheshire in 1967. The total and individual cross sections obtained in the five-state approximation exceed the corresponding cross sections obtained in the two-state approximation.
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V. Malaviya (1969) studied this question.
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