Photoionization Cross Section of Fe XXIV in Dense Plasma

 

Photoionization of atoms or highly charged ions plays a crucial role in various fields including Steller modelling, astrophysics, planetary science and also in laboratory plasma applications [1]. In this work, we investigate the effects of plasma screening on K-shell photoionization cross sections of the ground state and first two excited states of Li-like Fe XXIV ion embedded in a dense plasma environment using the relativistic distorted wave (RDW) [2,3] method. Plasma screening effects are incorporated using the analytical b-potential [4]. The wavefunctions for target states are constructed using relativistic configuration interaction (RCI) [2,5] technique. Plasma screening effects on the excited states and decay rates for the 1s^{2 1}S₀ → 1s3p ^3,1 P₁ transitions of target ion Fe XXV are studied for different plasma conditions. Additionally, we examine the influence of plasma screening on K-threshold, Auger widths, Auger energies, continuum wave function and ionization potential depression (IPD) for Li-like Fe XXIV ion in the dense plasma environment. Further, we investigate plasma-induced modifications to photoionization cross sections for the 1s²2s ²S_1/2 and 1s²2p ²P_1/2,3/2 states, as well as photorecombination rates for the 1s²2s ²S_1/2 and 1s²2p ²P_1/2 states of Li-like Fe XXIV. These calculations are performed over a density range of 2.0×10²³ to 1.0×10²⁴ cm^-3 and a temperature range of 100 - 500 eV. The present findings will be beneficial in the interpretation of spectral data from both astrophysical and laboratory plasma environments.