Angular dependence of double electron capture in collisions of C4+ with He
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In charge-transfer collisions of C4+(1s2 1S) with He (1s2 1S), the process of double electron capture into the ground state C2+ is well-known to dominate other channels by an order of magnitude for projectile energies below 10 keV. This work presents a calculation of differential cross-sections resolved in the angle and energy gain variables, based on an ab initio treatment of electronic states, and compares with the measurements published in the literature (projectile energy E=270, 400, and 470 eV). We also briefly discuss the semi-empirical two-state models developed by experimentalists for this process.
PACS.34.70.+e Charge transfer 31.15.Ar Ab initio calculations
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