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Coulomb-projected Born method; distorted wave; electron impact excitation; exchange potential; target polarization

We have calculated total and differential cross-sections for 1s →ns (n = 2, 3, 4) electron impact excitation of hydrogen and hydrogenic ions at various energies in Coulomb-projected Born approximation. Distortion due to static interactions, target polarization and exchange effects has been incorporated in the initial channel. The present calculations have been compared with other theoretical and experimental results.

V Kumar¹ B N Roy¹ D K Rai^{1 2}

1. Department of Physics, Bihar University, Muzaffarpur - 842 001, India
2. Department of Physics, Banaras Hindu University, Varanasi - 221 005, India

Published

January 1992

Manuscript received

31 January 1991

Manuscript revised

18 July 1991