• A K Chandra

      Articles written in Pramana – Journal of Physics

    • The short range interactions between two rare gas atoms

      K L Sebastian A K Chandra

      More Details Abstract Fulltext PDF

      The short range interactions in He2, Ne2 and Ar2 have been studied in terms of the electronic forces as functions of their internuclear separations employing their single configuration SCF wave functions. The results show that the constituent molecular orbitals behave differently in terms of the forces they exert on the nuclei during the interaction process. The different behaviour of the orbitals is also reflected in the redistribution of charges.

    • Stationary anharmonic oscillators in the particle-in-a-box basis: Near-exact results

      A K Chandra K Bhattacharyya

      More Details Abstract Fulltext PDF

      Variational studies employing the basis functions of the quantal particle-in-a-box model are shown to lead to accurate estimates of eigenvalues, various expectation values and eigenfunctions of the stationary anharmonic oscillator problem. Calculations involve bothzx and (x2+zx)-type oscillators, withα=2, 3 and 4, both in weak and strong coupling regime. Apart from its recommendable computational simplicity, convergence of the present recipe has also been demonstrated to be quite fast. Results for the first ten states are reported. A few goodness tests for the approximate wavefunctions and consistency requirements for some properties are also performed.

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