Theoretical study on the line shifts of He-like Al11+ ion immersed in a dense plasma

Abstract

We present relativistic multi-configuration Dirac-Fock calculations for the energies and oscillator strengths of He-like Al11+ ion within a dense plasma. The average-atom ion-sphere potential and the uniform electron gas model potential are used to represent the interaction between the charge particles. Self-consistent calculations of dense plasma effects on the atomic structure, based on the above two potentials, are also carried out using EPPP package，based on the Flexible Atomic Code for comparison purposes. While we find consistency between our two kinds of theoretical predictions, a discrepancy persists with the calculations of Li and Rosmej [Europhys. Lett. 99, 33001 (2012)]. We also present the line shifts of 1s2p→1s2 transition to compare with the recent measurements of Stillman et al. [Phys. Rev. E 95, 063204 (2017)]. Agreement between theory and experiment is far from perfect, the experimental values are generally 2.2 times higher than our predictions. A qualitative analysis of the physical reasons for such differences is given. Further precise measurements and systematic elaborate calculations are needed to support spectral analysis.