Two-electron excitation in helium-like ions by electron impact

Abstract

Calculation of cross-sections for the two-electron excitation in helium-like ions by electron impact employing Coulomb-Born-Oppenheimer (CBO) approximation is presented. Analytical expressions for the differential and total scattering cross-sections without using partial wave expansion of the wavefunction reported earlier have been used. The total and differential scattering cross-sections for each of the excitations 1 s 2 1 S* → 2 s 2 1 S e, 2 s2 p 1.3 P 0, 2 p 2 1 S e,3 P e,1 D e in Be2+ and B3+ are computed. Results for Li+ reported earlier are also included for comparison. © 1990 the Indian Academy of Sciences.