• Narendra Singh

      Articles written in Pramana – Journal of Physics

    • Photoionization of excited states of neon-like Mg III

      Narendra Singh Man Mohan

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      The close coupling R-matrix method is used to calculate cross-sections for photoionization of Mg III from its first three excited states. Configuration interaction wave functions are used to represent two target states of Mg III retained in the R-matrix expansion. The positions and effective quantum numbers for the Rydberg series converging to the excited state 2s22p62Se of the residual ion, are predicted.

    • Hermitian quark matrices

      Narendra Singh

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      Assuming a relation between the quark mass matrices of the two sectors a unique solution can be obtained for the CKM flavor mixing matrix. A numerical example is worked out which is in excellent agreement with experimental data.

    • Collisional excitation of neon-like Ni XIX using the Breit-PauliR-matrix method

      Narendra Singh Man Mohan

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      Collision strength for the transition within the first five fine-structure levels in Ni XIX are calculated using the Breit-PauliR-matrix method. Configuration interaction wave functions are used to represent the target states included in theR-matrix expansion. The relativistic effects are incorporated in the Breit-Pauli approximation by including the one-body mass correction, Darwin and spin-orbit interaction terms in scattering equations.

    • Fine-structure energy levels, oscillator strengths and lifetimes of chlorine-like chromium

      Man Mohan Avnindra K Singh Alok K S Jha Narendra Singh

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      We have done relativistic calculations for the evaluation of energy levels, oscillator strengths, transition probabilities and lifetimes for Cr VIII ion. Use has been made of configuration interaction technique by including Briet-Pauli approximation. The energies of various levels from the ground state to excited levels of 3s3p6, 3s23p43d, 3s23p44s, 3s23p44d of Cr VIII are given in LSJ coupling scheme after fine-tuning and are compared with the experimental results compiled in the NIST Data Base. Many new lines have been predicted which have not appeared so far in the NIST Data.

    • Energy levels and radiative rates for Ne-like ions from Cu to Ga


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      Energy levels, lifetimes and wave function compositions are computed for 127 fine structural levels in Ne-like ions (Z = 29−31). Configuration interaction has been included among 51 configurations (generating 1016levels) and multiconfigurational Dirac–Fock method is used to generate the wave functions. Similar calculations have also been performed using the fully relativistic flexible atomic code (FAC). Transition wavelength, oscillator strength, transition probabilities and line strength are reported for electric dipole (E1), electric quadrupole (E2), magnetic dipole (M1) and magnetic quadrupole (M2) transitions from the ground level. We compared our calculated results with the available data in the literature. The calculated results are found to be in close agreement with the previous results. Further, we predict some new atomic data which may be important for plasma diagnostics.

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