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Two-electron excitation cross-section; electron impact; Coulomb-Born-Oppenheimer approximation

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* → 2s²¹S^e, 2s2p^1.3P⁰, 2p²¹S^e,³P^e,¹D^e in Be²⁺ and B³⁺ are computed. Results for Li⁺ reported earlier are also included for comparison.

B Padhy¹ D K Rai^{1 2}

1. Department of Physics, B.J.B. College, Bhubaneswar - 751 014, India
2. Department of Physics, Banaras Hindu University, Varanasi - 221 005, India

Published

September 1990

Manuscript received

31 January 1989

Manuscript revised

8 May 1990