Relativistic Calculation of Energies, Transition Parameters Hyperfine Structure, Landé g$_J$ and Isotope shifts factors for Ar$^{7+}$, Kr$^{25+}$ and Xe$^{43+}$ ions

Abstract

In this study, comprehensive calculations of energies, hyperfine structure constants, Landé g J factors and isotope shifts have been performed for the lowest 71 states of Na-like Ar 7+ , Kr 25+ and Xe 43+ ions. Radiative parameters viz., wavelengths, transition rates, oscillator strengths and lifetimes are also estimated for the electric and magnetic dipole (E1,M1) and quadrupole (E2,M2) transitions among these levels. The states under consideration include 1s 2 2s 2 2p 6 nl for n = 3−9, l = 0 − 6, and the fully relativistic multiconfiguration Dirac-Fock (MCDF) method integrated in the latest version of the general-purpose relativistic atomic structure package (GRASP) is used for the calculations. The relativistic corrections, viz., Breit interactions and quantum electrodynamics effects are also included in the present work and their effects on energies and other parameters are analysed. We also examined the impact of including the core-core and core valence correlations on level energies. Further, to inspect the reliability of our MCDF results, we performed another set of calculations using the many-body perturbation theory inbuilt into the Flexible Atomic Code (FAC). A thorough comparison between the two obtained calculations and with the previous theoretical and experimental results, wherever available, is carried out and a good agreement is observed. The present calculations will considerably extend the already existing results for these Na-like ions as most of the results are reported for the first time. Further, we believe that our results are of high accuracy and will be beneficial for spectral analysis and diagnosis in plasma and astrophysics.