• P M Patel

      Articles written in Pramana – Journal of Physics

    • Correlation-polarization effects in electron-atom scattering

      K N Joshipura P M Patel

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      The correlation-polarization (CP) model-potential, given by O’Connell and Lane (1983) as well as Padial and Norcross (1984) is examined for the elastic scattering of electrons by oxygen atoms, at intermediate energies. The correlation potential is found to be stronger than necessary at low energies. Two model polarization potentials based on the CP model, are suggested and employed to thee — O scattering at 8.7, 30, 50 and 100 eV energies. The calculated total cross-sections agree in general with the other data at these energies.

    • Total electron scattering cross-sections for O atoms: O2 and O3 molecules

      K N Joshipura P M Patel

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      Total (elastic+inelastic) cross sections fore-O,e-O2 ande-O3 scattering have been calculated at sample energies between 100 and 1000eV. The basice-O atom scattering amplitudes are obtained from the partial wave analysis with a complex optical potential. Thee-O2 ande-O3 cross-sections are obtained through the independent atom model. Oure-O2 cross-sections reproduce the experimental data quite well. Adequate comparisons are made in all the three cases.

    • Vibrationally elastice — H2O scattering at intermediate energies

      K N Joshipura Minaxi Vinodkumar P M Patel

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      Vibrationally elastic total cross-sections ofe—H2O scattering are calculated at intermediate energiesEi=10–300 eV. The interaction potentials are treated in spherical models. The dipole rotational excitation, which is significant but not dominant above 10 eV, is treated incoherently. Effects of electronic excitation-ionization, significant above 30 eV or so, are considered through a complex optical potential. A dynamically distorted charge-density is employed to calculate the imaginary part of the complex potential. Comparisons are made with recent theoretical and experimental data. The mutual agreement is better in total cross-sections than in differential cross-sections.

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