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 1s21S* → 2s21Se, 2s2p1.3P0, 2p21Se,3Pe,1De in Be2+ and B3+ are computed. Results for Li+ reported earlier are also included for comparison.
Volume 95, 2021
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