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The three-state atomic expansion is used to calculate the variations of the double-charge-exchange probabilities with energy E and scattering angle theta for He2+-He collisions. The theoretical calculations cover incident He2+ energies in the range 1-50 keV and scattering angles between 1.2 and 3.0 degrees . The calculated results are found to be in qualitative agreement with the existing experimental results of Keever and Everhart (1966).
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Roy et al. (1976) studied this question.
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