• L K Jha

      Articles written in Pramana – Journal of Physics

    • Electron impact double ionization of Ba and Ba+

      L K Jha S N Chatterjee B N Roy

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      Electron impact double ionization cross-sections for Ba and Ba+ have been calculated in the binary encounter approximation. Hartree-Fock velocity distribution has been used for the first ejected electron and a hydrogenic velocity distribution for the second. For Ba+ the focusing effects of the target ion on the incident electron have been incorporated in the calculations. Contributions from ionization-autoionization to the ionization cross-sections, as observed in experiments, have been included in the present work. The calculated results show structures as observed in recent experiments.

    • Electron impact single ionization of copper

      L K Jha O P Roy B N Roy

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      Electron impact single ionization cross sections of copper have been calculated in the binary encounter approximation using accurate expression for σΔE as given by Vriens and Hartree-Fock momentum distribution for the target electron. The BEA calculation based on the usual procedure does not show satisfactory agreement with experiment in this case but a striking modification is found to be successful in explaining the experimental observations. The discrepancy is linked with the ionization of the 3d10 electrons and probably effective single ionization does not take place from 3d shell of copper leading to smaller values of experimental cross sections.

    • Single and double ionization of gallium by electron impact

      L K Jha

      More Details Abstract Fulltext PDF

      Electron impact single and double ionization cross sections of gallium have been calculated in the binary encounter approximation using accurate expression for σΔ;E including exchange and interference as given by Vriens and Hartree-Fock velocity distributions for the target electrons throughout the calculations. It is concluded that the ionization of 3d shell contributes partly to single ionization and partly to double ionization. The results so obtained show reasonably good agreement with the experimental data.

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