Photoabsorption and resonance structure in Ne-like P5+, S6+ and Cl7+ ions: A relativistic configuration interaction approach

Abstract

We report in this paper complete data sets of ionization limits, resonance positions, transition rates, and oscillator strengths yields for electric dipole (E1) transitions from the ground state 2s² 2p⁶ (¹S₀) to excited configurations - mainly 1s² 2s 2p⁶ (²S_1/2) np (¹P₁), 1s 2s² 2p⁶ (²S_1/2) np (¹P₁), and 2s² 2p⁵ (²P_{3/2, 1/2}) ns and nd- for Ne-like (P⁵⁺, S⁶⁺ and Cl⁷⁺) ions. The present data have been computed by employing relativistic configuration interaction (RCI) method implemented in the Flexible Atomic Code (FAC). A new comprehensive dataset on K-shell excitations (1s 2s² 2p⁶ (²S_1/2) np) in P⁵⁺, S⁶⁺ and Cl⁷⁺ ions are presented. Some calculated atomic data for the assigned neon ions reported in this paper are compared against available literature data and the NIST database. Overall, a good agreement is observed. These data are vital for understanding atomic spectra and ionization dynamics, enabling accurate modeling X-ray photoabsorption in astrophysical plasmas and increasing spectral diagnostics in high-resolution observations.