Theoretical study on the line shifts of He-like Al11+ ion immersed in a dense plasma. (July 2020)

• Record Type: Journal Article
• Authors: Chen, Zhan-Bin; Wang, Kai
• Is Part Of: Radiation physics and chemistry. Volume 172(2020:Jul.)
• Publication Date: 2020-07
• Subjects: Line shifts -- Oscillator strengths -- Al11+ ion -- Plasma shielding effects; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2020.108816
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: We present relativistic multi-configuration Dirac-Fock calculations for the energies and oscillator strengths of He-like Al 11+ 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 1 s 2 p → 1 s 2 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. Highlights: Line shifts and oscillator strengths of Al 11+ ion within a dense plasma are investigated. The MCDF and FAC incorporating the average-atom ion-sphere model are developed/employed. Agreement between theory and experiment is far from perfect.