E1, M1, E2 transition energies and probabilities of W$^{54+}$ ions

TL;DR

This study provides detailed theoretical calculations of E1, M1, and E2 transition energies and probabilities for W$^{54+}$ ions using MCDF, offering data valuable for plasma diagnostics and comparison with experiments.

Contribution

The paper applies a multi-configuration Dirac-Fock method to calculate transition data for tungsten ions, highlighting the significance of electron correlation effects on E2 transitions.

Findings

Calculated transition wavelengths and probabilities agree with experimental data.

Identified several strong E1 transitions useful for plasma diagnostics.

Emphasized the importance of electron correlation in E2 transition calculations.

Abstract

A comprehensive theoretical study of the E1, M1, E2 transitions of Ca-like tungsten ions is presented. Using multi-configuration Dirac-Fock (MCDF) method with a restricted active space treatment, the wavelengths and probabilities of the M1 and E2 transitions between the multiplets of the ground state configuration ([Ne]3s$^{2}$3p$^{6}$3d$^{2}$) and of the E1 transitions between [Ne]3s$^{2}$3p$^{5}$3d$^{3}$ and [Ne]3s$^{2}$3p$^{6}$3d$^{2}$ have been calculated. The results are in reasonable agreement with available experimental data. The present E1 and M1 calculations are compared with previous theoretical values. For E2 transitions, the importance of electron correlation from 3s and 3p orbitals is pointed out. Several strong E1 transitions are predicted, which have potential advantage for plasma diagnostics.