Energy Levels, Lifetimes and Transition rates for P-like ions from Cr X to Zn XVI from large-scale Relativistic Multiconfiguration Calculations

TL;DR

This paper presents comprehensive relativistic calculations of energy levels, lifetimes, and transition rates for P-like ions from Cr X to Zn XVI, providing valuable data for astrophysical applications and line identification.

Contribution

It introduces large-scale relativistic multiconfiguration calculations for P-like ions, significantly expanding high-accuracy energy and transition data where experimental data are limited.

Findings

Computed energies agree within 0.057% with observed values for Fe XII

Transition data enhances astrophysical line identification

Systematic inclusion of electron correlation effects

Abstract

The fully relativistic multiconfiguration Dirac--Hartree--Fock method is used to compute excitation energies and lifetimes for the 143 lowest states of the $3s^23p^3$, $3s3p^4$, $3s^23p^23d$, $3s3p^33d$, $3p^5$, $3s^23p3d^2$ configurations in P-like ions from Cr X to Zn XVI. Multipole (E1, M1, E2, M2) transition rates, line strengths, oscillator strengths, and branching fractions among these states are also given. Valence-valence and core-valence electron correlation effects are systematically accounted for using large basis function expansions. Computed excitation energies are compared with the NIST ASD and CHIANTI compiled values and previous calculations. The mean average absolute difference, removing obvious outliers, between computed and observed energies for the 41 lowest identified levels in Fe XII is only 0.057 \%, implying that the computed energies are accurate enough to aid identification of new emission lines from the sun and other astrophysical sources. The amount of energy and transition data of high accuracy is significantly increased for several P-like ions of astrophysics interest, where experimental data are still very scarce.