Extended Calculations with Spectroscopic Accuracy: Energy Levels and Radiative Rates for O-like Ions between Ar XI and Cr XVII

TL;DR

This paper provides highly accurate energy levels and radiative rates for O-like ions from Ar XI to Cr XVII using advanced relativistic methods, aiding plasma diagnostics and spectral line identification.

Contribution

It offers a comprehensive and precise dataset of transition energies and radiative rates for multiple O-like ions, significantly expanding available high-accuracy data for n=3 states.

Findings

Data agree well with NIST and previous calculations.

Enhanced accuracy for n=3 states of O-like ions.

Facilitates identification of spectral lines in astrophysical and laboratory plasmas.

Abstract

Using the multiconfiguration Dirac-Hartree-Fock and the relativistic configuration interaction methods, a consistent set of transition energies and radiative transition data for the main states of the $2s^2 2p^4$, $2s 2p^5$, $2p^6$, $2s^2 2p^3 3s$, $2s^2 2p^3 3p$, $2s^2 2p^3 3d$, $2s 2p^4 3s$, $2s 2p^4 3p$, and $2s 2p^4 3d$ configurations in O-like Ions between Ar XI ($Z = 18$) and Cr XVII ($Z = 24$) is provided. Our data set is compared with the NIST compiled values and previous calculations. The data are accurate enough for identification and deblending of new emission lines from hot astrophysical and laboratory plasmas. The amount of data of high accuracy is significantly increased for the $n = 3$ states of several O-like ions, where experimental data are very scarce.