• Gopaljee

      Articles written in Pramana – Journal of Physics

    • Electron impact single and double ionization of halogens

      Gopaljee S N Chatterjee B N Roy

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      The binary encounter approximation has been used for calculations of electron impact single ionization cross-sections for F, Cl, Br and I and double ionization cross-sections for Br and I. Contributions of ionization from inner shells have also been included in the calculations. Hartree-Fock momentum distribution has been used for the bound electron as far as possible. The results have been found to be in satisfactory agreement with experimental observations.

    • Electron impact ionization of Zn+ and Ga+

      Gopaljee S K Shrivastava B N Roy

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      We have investigated the contribution of excitation-autoionization to the electron impact ionization of Zn+ and Ga+ using the binary encounter approximation. Hartree-Fock velocity distributions for the bound electrons have been used throughout the calculations of direct and indirect ionization cross-sections. The calculated cross-sections are in good agreement with recent experiments. We have also compared our results with other theoretical calculations.

    • Electron impact ionization of Ba, Ba+ and Ba2+

      Gopaljee S K Shrivastava B N Roy

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      The binary encounter approximation has been used to investigate the effect of charge state of the target atom (ion) on the electron impact excitation autoionization cross-sections. Roothan-Hartree-Fock (RHF) velocity distribution for the bound electrons has been used through-out the calculations. The present results give a good account of the experimental observations.

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