K-Shell photoabsorption in Si11+: Relativistic contributions via Breit-Pauli R-matrix calculations. (16th September 2021)

• Record Type: Journal Article
• Authors: Hasoglu, M F; Gorczyca, T W; Manson, S T
• Is Part Of: Physica scripta. Volume 96:Number 12(2021)
• Publication Date: 2021-09-16
• Subjects: numbers -- 34.80.Lx -- 31.15.vj -- 32.80.Zb -- photoionization -- inner shell -- R-matrix; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ac0b84
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: As a part of the investigation of the entire Si isonuclear sequence for x-ray spectral diagnostics, we focus on the Li-like Si 11+ ion, a stable component that features prominently in x-ray astrophysical spectra. We perform R-matrix calculations for the photoabsorption cross section of Si 11+ including relativistic contributions via the use of a Breit-Pauli Hamiltonian. Relativistic effects—predominantly spin-orbit splitting of resonances and mass-velocity and one-body Darwin global shifts of energies —are shown to be tractable and of importance for accuracy in x-ray spectral modeling data banks.