Abstract
The cross section for the resonant electron transfer process Ba/sup +/+Ba..-->..Ba+Ba/sup +/ is calculated for collision energies up to 800 keV. Energy curves for the /sup 2/..sigma../sub u//sup +/ and /sup 2/..sigma../sub g//sup +/ molecular states are first obtained using the multiconfiguration valence-bond method. The cross section is then obtained from the energy curves using the two-state impact parameter version of the perturbed stationary states method. The differential cross section is obtained using the eikonal method. Total cross-section values up to approximately 200..pi..a/sub o//sup 2/ are obtained. At low energies the total cross section exhibits rapid, strong interference oscillations of the type commonly considered to be associated with local extrema in the two-state energy difference. The differential cross-section results clearly show that impact-parameter-dependent structural details of the transfer probability are not directly observable.
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