Radiative rates for E1, E2, M1, and M2 transitions in Ne-like Hf LXIII, Ta LXIV and Re LXVI

TL;DR

This paper presents detailed relativistic calculations of energy levels, radiative rates, and lifetimes for three Ne-like ions using GRASP and FAC, providing comprehensive data where experimental results are unavailable.

Contribution

It offers new theoretical data for Ne-like Hf LXIII, Ta LXIV, and Re LXVI ions, including extensive configuration interaction effects using two different atomic codes.

Findings

Results show good agreement with previous theoretical data.

Large configuration interaction significantly affects energy level calculations.

No experimental data available for direct comparison.

Abstract

Calculations for energy levels, radiative rates and lifetimes have been performed for three Ne-like ions, namely Hf~LXIII, Ta LXIV and Re LXVI, for which the general-purpose relativistic atomic structure package (GRASP) has been adopted. Results are presented among the lowest 121 levels of these ions, which belong to the 2s$^2$2p$^6$, 2s$^2$2p$^5$3$\ell$, 2s2p$^6$3$\ell$, 2s$^2$2p$^5$4$\ell$, 2s2p$^6$4$\ell$, and 2s$^2$2p$^5$5$\ell$ configurations, but CI (configuration interaction) has been considered among a much larger number of levels. No measurements for energy levels are available but comparisons have been made with the earlier similar theoretical results. Additionally, calculations have also been performed with the flexible atomic code (FAC) in order to assess the effect of (much) larger CI on energy levels.