An extended multireference procedure of the transition energies, probabilities, and lifetimes of carbon-like W LXIX using the multiconfiguration Dirac–Hartree–Fock (MCDHF) method

Abstract

Within the framework of the multiconfiguration Dirac-Hartree–Fock (MCDHF) approach, the transition energies, lifetimes, and probabilities of carbon-like W LXIX were computed using an extended multireference (Ex-MR) procedure. The static electron correlation effect was addressed by expanding the multireference (MR) method to incorporate not only the desired even configurations $2s^{2}2p^2$, $2p^4$, $2s^{2}2p3p$, $2s2p^{2}3s$, $2p^{3}3p$, $2s2p^{2}3d$ and odd $2s2p^3$, $2s2p^{2}3p$, $2s^{2}2p3s$, $2s^{2}2p3d$, $2p^{3}3d$, $2p^{3}3s$, but also configuration state functions (CSF) that make substantial contributions to the overall wave functions, with mixing coefficients of $\ge$ 0.03. The dynamic electron correlation effect was included by expanding the atomic state expansions with CSFs, which were created by allowing unrestricted single-double (SD) electron substitutions from the EX-MR to four layers with the principal quantum numbers n $\le$ 6. We compared the current results with the available computations provided by MCDHF and FAC. The data that are being calculated are useful for many astrophysical tasks, mainly finding spectral lines and diagnostics of fusion and astrophysical plasma.