Plasma screening effects on the atomic structure of He-like ions embedded in strongly coupled plasma

Abstract

The influence of plasma screening on the transition energies and radiative properties of He-like ions embedded in dense plasma environment has been analyzed. For this purpose, the multiconfiguration Dirac-Fock method and Flexible Atomic Code incorporating the analytical plasma screening potential of Li et al. (2019) [39] and uniform electron gas model potential have been implemented. Our calculated line shifts of 1s2S01→1s3pP1o1 He-β transition of Cl15+ are in excellent agreement with the recent measurements of Beiersdorfer et al. (2019) [11]. The plasma shielding effects on 1s2S01→1snpP1o3(n=2,3) and 1s2S01→1snpP1o1(n=2,3) transitions of Ar16+, Ti20+ and Fe24+ ions have also been studied. It is found that transition energies for these transitions are red shifted with respect to free electron densities. The present results should be advantageous in the modeling and diagnostics of laboratory and astrophysical plasmas.