Calculations with spectroscopic accuracy: energies and transition rates in the nitrogen isoelectronic sequence from Ar XII to Zn XXIV

TL;DR

This paper provides highly accurate calculations of energies and transition rates for nitrogen-like ions from Ar XII to Zn XXIV, aiding spectral analysis in astrophysics and fusion research.

Contribution

It offers a comprehensive, consistent dataset of atomic parameters for 359 levels across multiple ions, significantly expanding existing data with high accuracy.

Findings

High-accuracy energy levels for 359 states

Complete transition data for electric and magnetic multipoles

Enhanced spectral identification and plasma modeling capabilities

Abstract

Combined relativistic configuration interaction and many-body perturbation calculations are performed for the 359 fine-structure levels of the $2s^2 2p^3$, $2s 2p^4$, $2p^5$, $2s^2 2p^2 3l$, $2s 2p^3 3l$, $2p^4 3l$, and $2s^2 2p^2 4l$ configurations in N-like ions from Ar XII to Zn XXIV. A complete and consistent data set of energies, wavelengths, radiative rates, oscillator strengths, and line strengths for all possible electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole transitions among the 359 levels are given for each ion. The present work significantly increases the amount of accurate data for ions in the nitrogen-like sequence, and the accuracy of the energy levels is high enough to serve identification and interpretation of observed spectra involving the $n=3,4$ levels, for which the experimental values are largely scarce. Meanwhile, the results should be of great help in modeling and diagnosing astrophysical and fusion plasmas.