Transition frequencies, isotope shifts, and hyperfine structure in $4s \rightarrow 4p$ transitions of Ti$^+$ ions

TL;DR

This study precisely measured transition frequencies, isotope shifts, and hyperfine structures in Ti$^+$ ions, providing valuable reference data for isotope analysis and fundamental physics tests involving the fine structure constant.

Contribution

The paper presents new high-precision measurements of Ti$^+$ ion transitions, isotope shifts, and hyperfine structures using collinear laser spectroscopy, aiding future astrophysical and nuclear research.

Findings

Measured transition frequencies and hyperfine splittings for Ti$^+$

Provided isotope shift data relevant for isotope identification

Supplied reference values for astrophysical and fundamental physics studies

Abstract

We have measured transition frequencies, isotope shifts and hyperfine structure splittings in the $3 d^{2}\left({ }^{3\!}F\right) 4 s\,{ }^{4} F_J\rightarrow 3 d^{2}\left({ }^{3\!} F\right) 4 p \,^{4} G_{J+1}$ transitions in Ti$^+$ ions for $J=\frac{3}{2},\, \frac{5}{2},\, \frac{7}{2}$ using collinear laser spectroscopy. Ions were generated by laser ablation in a buffer gas atmosphere and extracted into vacuum through a nozzle and a pair of radiofrequency (RF) funnels. The obtained results are of interest as reference values for on-line measurements of short-lived titanium isotopes and for astrophysical searches for temporal or spatial variations of the fine structure constant $\alpha$ using quasar absorption spectra.