• Anand Bharadvaja

      Articles written in Pramana – Journal of Physics

    • Systematic trends in the line strengths and radial matrix elements of E1 transitions in the Be isoelectronic sequence

      Anand Bharadvaja K L Baluja

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      Line strengthS and radial matrix elementσ for the dipole allowed transitions withinn=2 complex of ions in the Be isoelectronic sequence have been fitted in the formsZ2S=A+B/(Z − C) andZσ=A′ + B′/(Z − C′). The constantsA, B, C andA′, B′, C′ have been calculated by employing a non-linear least square method. The relevant data forS andσ have been taken from calculations which includes correlation effects. It is shown that the fitted yalues ofA andA′ are in excellent accord with their hydrogenic values (Zα) provided that we express the zeroth-order wavefunction of the ground state 1s22s21S as a quantum-mechanical admixture of the Hartree-Fock (HF) state 1s22s21S and the near-degenerate state 1s22p21S.

    • Low-energy electron impact cross-sections and rate constants of $NH_2$


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      This systematic study reports various electron impact cross-sections, rate constants and transport properties of $NH_2$ radical in the low-energy limit. The collision study is based on $R$-matrix formalism and involves the use of various scattering models employing different active spaces. Both electron excited inelasticcross-sections and resonances are found influenced by correlation and polarization effects. The non-relativistic molecular bremsstrahlung radiation cross-section for soft photons, binary encounter Bethe model-based ionization cross-sections and a few molecular properties of the target radical are also reported. The present calculations are found to be in agreement with the available results. This theoretical study provides a pathway to understand collision dynamics and generates data required in various fields of applied physics.

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