Calculation of electron capture cross sections of collisions of Be²⁺on H

Using the perturbed stationary state method, including electron translation factors, the authors have calculated electron capture cross sections for the helium-like ions Be 2+ and B 3+ incident on ground-state atomic hydrogen. The molecular structure calculation employs pseudo-potentials to represent the inactive K-shell electrons on the incident ions. The calculated cross sections vary rapidly in the 10 7 cm s -1 velocity range (E approximately 1 keV amu -1 ). The calculations show preferential transfer to the Be + (2s) and the B 2+ (2p) product states. The calculations for B 3+ +H are in good agreement with experimental measurements of Cradall et al (1979). In addition, the calculations indicate the importance of including rotational coupling to 2 Pi states when determining state-to-state cross sections.