• S K Shrivastava

      Articles written in Pramana – Journal of Physics

    • Proton and α-particle impactM-shell ionization of atoms in binary encounter approximation

      Vijay Kumar S K Shrivastava B N Roy

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      M-shell ionization cross sections for atoms due to the impact of proton and α-particles have been calculated in the binary encounter approximation. The effects of Coulomb deflection of the incident projectile and increase in binding of the target electron have been investigated. Roothan-Hartree-Fock velocity distribution for the target electrons has been used in the present work. The calculated cross-sections have been compared with experimental results and other theoretical calculations wherever available. The present calculations give a good account of 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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