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Photoionization of Na-like Si IV using R-matrix method

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Abstract

Photoionization cross-section results for the ground state 2p63s (2S1/2) along with the lowest four excited states 2p63p (2Po1/2, 3/2) and 2p63d (2D5/2, 3/2) of Na-like Si IV are reported by employing the close-coupling Breit–Pauli R-matrix (BPRM) method. The target state wavefunctions of Si V ion have been obtained using the configuration interaction method (CIV3) in the LSJ-coupling scheme. Relativistic effects and all key physical effects such as short-range correlations, exchange and channel coupling are considered in the computations. Our evaluated target state energies of the Si V core ion show close agreement with the NIST database. Quigley and Berrington (QB) technique is applied to determine resonance positions (Er) and autoionization line widths (Γ) with quantum defects caused by the removal of the 2p electron from 2s22p63s 2S1/2, the ground state of Si IV. To the best of our understanding, the study presented here details thorough relativistic photoionization calculations for this system for the first time. We hope that our results will be valuable to astrophysical and laboratory plasma modeling and diagnosis.

Graphical Abstract

Photoionization cross-sections (σ) for the ground state 2p63s (2S1/2) of Si IV.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The data that supports the findings of this study are available from the corresponding author upon reasonable request.]

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Acknowledgements

Nupur Verma is thankful to Deen Dayal Upadhyaya College administration for the constant encouragement and motivation. Alok K. S. Jha is thankful to Jawaharlal Nehru University for providing the necessary resources.

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  1. Department of Physics, Deen Dayal Upadhyaya College, University of Delhi, Delhi, 110078, India

    Nupur Verma

  2. School of Physical Sciences, Jawaharlal Nehru University, Delhi, 110067, India

    Alok K. S. Jha

  3. Department of Physics & Astrophysics, University of Delhi, Delhi, 110007, India

    Dishu Dawra, Mayank Dimri & Man Mohan

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Verma, N., Jha, A.K.S., Dawra, D. et al. Photoionization of Na-like Si IV using R-matrix method. Eur. Phys. J. D 77, 134 (2023). https://doi.org/10.1140/epjd/s10053-023-00716-3

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