Relativistic atomic structure calculations with application in fusion plasma

In our work, we have calculated excitation energies or transition wavelengths, radiative rates, oscillator strength, line strength for fifteen Be like ions including Be-like W⁷⁰⁺, Ni²⁴⁺ and Sn⁴⁶⁺ which are of particular interest for this project and also studied dependence of plasma parameters on plasma temperature and electron density for hot dense plasmas. The ratio of the intensities of spectral lines within HDP is calculated as a function of electron temperature. For the calculations of energy levels and radiative rates, we have used the multiconfiguration Dirac-Hartree-Fock (MCDHF) method employed in GRASP2K code. The calculations are carried out in the active space approximation with the inclusion of the Breit interaction, the finite nuclear size effect, and quantum electrodynamics (QED) corrections. We have considered valence-valence, core-valence and core-core correlations in our calculations by taking single, double, triple and quartet (SDTQ) excitations. We have also assessed the accuracy of our results and also compared our GRASP2K results with calculated excitation energies from FAC and other theoretical, NIST and experimental results.