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

Abstract

We have measured transition frequencies, isotope shifts and hyperfine structure splittings in the $3d^2\left({}^{3}F\right)4s{}^4{F}_J\to 3d^2\left({}^{3}F\right)4p{}^4{G}_{J+1}$ 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 $\hat{I}\pm$ using quasar absorption spectra.