Regular Article – Atomic Physics
Influence of strongly coupled plasma on the low-lying transitions of Be-like ions
Department of Physics and Astrophysics, University of Delhi, 110007, New Delhi, Delhi, India
2 Department of Physics, Deen Dayal Upadhyaya College, University of Delhi, 110078, New Delhi, Delhi, India
3 Department of Physics, Kirori Mal College, University of Delhi, 110007, New Delhi, Delhi, India
4 Department of Physics, Hindu College, University of Delhi, 110007, New Delhi, Delhi, India
5 School of Physical Sciences, Jawaharlal Nehru University, 110067, New Delhi, Delhi, India
Accepted: 1 November 2022
Published online: 22 November 2022
The influence of plasma screening on the intercombination 2s21S0 → 2snp3(n = 2, 3) and resonance 2s2 1S0 → 2snp1(n = 2, 3) transitions of Be-like Si10+, Ca16+ and Fe22+ ions immersed in strongly coupled plasma environment is investigated. The multiconfiguration Dirac–Fock method and relativistic configuration interaction technique have been implemented within the general framework of the ion sphere theory. It has been found that the transition energies associated with Δn = 0 transitions are blue shifted, while the energies corresponding to Δn ≠ 0 transitions are red shifted. The variation of weighted oscillator strengths with free electron density has been studied. Thermodynamic pressure experienced by the ions in the ground state 2s2 1S0 inside the ion sphere is also reported. The results of this study should be of great help in the modeling and the interpretation of spectral properties in laboratory and astrophysical plasmas.
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