Energy levels and radiative rates for transitions in Ti VI

TL;DR

This paper presents detailed calculations of energy levels, radiative rates, and transition data for Ti VI, providing accurate atomic data useful for plasma modeling and astrophysical applications.

Contribution

It offers comprehensive, relativistic atomic data for Ti VI's lowest 253 energy levels, including transition probabilities and lifetimes, with improved accuracy estimates.

Findings

Energy levels accurate to better than 1%.

Radiative rates and oscillator strengths estimated with ~20% accuracy.

Comparison with existing data highlights the need for reassessment of NIST levels.

Abstract

We report on calculations of energy levels, radiative rates, oscillator strengths, and line strengths for transitions among the lowest 253 levels of the (1s$^2$2s$^2$2p$^6$) 3s$^2$3p$^5$, 3s3p$^6$, 3s$^2$3p$^4$3d, 3s3p$^5$3d, 3s$^2$3p$^33d^2$, 3s$^2$3p$^4$4s, 3s$^2$3p$^4$4p and 3s$^2$3p$^4$4d configurations of Ti VI. The general-purpose relativistic atomic structure package ({\sc grasp}) and flexible atomic code ({\sc fac}) are adopted for the calculations. Radiative rates, oscillator strengths and line strengths are reported for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2) and magnetic quadrupole (M2) transitions among the 253 levels, although calculations have been performed for a much larger number of levels. Comparisons are made with existing available results and the accuracy of the data is assessed. Additionally, lifetimes for all 253 levels are listed, although comparisons with other theoretical results are limited to only 88 levels. Our energy levels are estimated to be accurate to better than 1% (within 0.03 Ryd), whereas results for other parameters are probably accurate to better than 20%. A reassessment of the energy level data on the NIST website for Ti VI is suggested.