Theoretical spectroscopic studies of the atomic transitions and lifetimes of low-lying states in Ti IV

TL;DR

This paper presents highly accurate theoretical calculations of electric quadrupole and magnetic dipole transitions, excitation energies, and lifetimes of low-lying states in Ti IV using advanced relativistic coupled cluster theory, with results supporting astrophysical applications.

Contribution

The study applies state-of-the-art relativistic coupled cluster theory to compute atomic transition properties of Ti IV, providing new data not previously available in literature.

Findings

Calculated excitation energies agree well with measurements.

Identified a long lifetime for the 3d$^{2}D_{5/2}$ state.

Most results are novel and not reported before.

Abstract

The astrophysically important electric quadrupole (E2) and magnetic dipole (M1) transitions for the low-lying states of triply ionized titanium (Ti IV) are calculated very accurately using a state-of-art all-order many-body theory called Coupled Cluster (CC) theory in the relativistic frame-work. Different many-body correlations of the CC theory has been estimated by studying the core and valence electron excitations to the unoccupied states. The calculated excitation energies of different states are in very good agreement with the measurements. Also we compare our calculated electric dipole (E1) transition amplitudes of few transitions with recent many-body calculations by different groups. We have also carried out the calculations for the lifetimes of the low-lying states of Ti IV. A long lifetime is found for the first excited 3d$^{2}D_{5/2}$ state, which suggested that Ti IV may be one of the useful candidates for many important studies. Most of the results reported here are not available in the literature, to the best of our knowledge.