• S N Tiwary

      Articles written in Pramana – Journal of Physics

    • Inner-shell excitation of alkali-metal atoms

      S N Tiwary

      More Details Abstract Fulltext PDF

      Inner-shell excitation of alkali-metal atoms, which leads to auto-ionization, is investigated. Comparison is made with other available data. Basic difficulties in making accurate calculations for inner-shell excitation process are discussed. Suggestions are made for further study of inner-shell process in atoms and ions.

    • Multiconfiguration Hartree-Fock calculations in Cr5+, Mn6+ and Fe7+

      S N Tiwary P Kumary R P Roy

      More Details Abstract Fulltext PDF

      The multiconfiguration Hartree-Fock (MCHF) method is used to calculate the excitation energies and oscillator strengths, of both the length (fL) and velocity (fV) forms, for 1s22s22p63s23p63d2D→1s22s22p63s23p53d22P0,2D0,2F0 transitions in Cr5+, Mn6+ and Fe7+ ions of the potassium isoelectronic sequence. Comparison is made with our earlier relevant results obtained by employing the configuration interaction (CI) method which is closely related to the MCHF method. Our present investigation demonstrates that the MCHF method is more accurate than the CI method in all ions of present consideration.

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