# Extended Calculations of Spectroscopic Data: Energy Levels, Lifetimes and Transition rates for O-like ions from Cr XVII to Zn XXIII

## TL;DR

This paper provides extensive spectroscopic data for O-like ions from Cr XVII to Zn XXIII using advanced computational methods, aiding astrophysical line identification and expanding high-accuracy data for scarce experimental states.

## Contribution

It introduces comprehensive calculations of energy levels, lifetimes, and transition rates for multiple configurations of O-like ions using two state-of-the-art methods, significantly expanding available high-accuracy data.

## Key findings

- Data agree well with NIST and CHIANTI values
- Enhanced data for n=3 states of astrophysical interest
- Improved identification of emission lines in astrophysics

## Abstract

Employing two state-of-the-art methods, multiconfiguration Dirac--Hartree--Fock and second-order many-body perturbation theory, the excitation energies and lifetimes for the lowest 200 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, and multipole (electric dipole (E1), magnetic dipole (M1), and electric quadrupole (E2)) transition rates, line strengths, and oscillator strengths among these states are calculated for each O-like ion from Cr XVII to Zn XXIII. Our two data sets are compared with the NIST and CHIANTI compiled values, and previous calculations. The data are accurate enough for identification and deblending of new emission lines from the sun and other astrophysical sources. The amount of data of high accuracy is significantly increased for the $n = 3$ states of several O-like ions of astrophysics interest, where experimental data are very scarce.