https://doi.org/10.1140/epjd/s10053-023-00716-3
Regular Article – Atomic and Molecular Collisions
Photoionization of Na-like Si IV using R-matrix method
1
Department of Physics, Deen Dayal Upadhyaya College, University of Delhi, 110078, Delhi, India
2
School of Physical Sciences, Jawaharlal Nehru University, 110067, Delhi, India
3
Department of Physics & Astrophysics, University of Delhi, 110007, Delhi, India
Received:
9
March
2023
Accepted:
22
June
2023
Published online:
14
July
2023
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 2s22p63s2S1/2, 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.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
