On the $\Lambda$-doubling in the B$^3\Pi_1$ state of TlF

TL;DR

This paper re-analyzes high-resolution spectra of TlF to better understand the hyperfine structure and the magnitude of $ ext{Lambda}$-doubling in the B-state, which is crucial for precision measurements and laser cooling applications.

Contribution

The study provides a detailed re-analysis of hyperfine spectra of TlF's B-state, focusing on $ ext{Lambda}$-doubling, enhancing understanding for precision measurement applications.

Findings

Refined measurement of $ ext{Lambda}$-doubling in TlF B-state.

Insights into rotational level mixing relevant for laser cooling.

Improved hyperfine structure characterization of TlF.

Abstract

Thallium monofluoride (TlF) is a prime candidate molecule for precision measurements aimed at discovering new physics. Optical cycling on the B $\leftarrow$ X transition around 271 nm enhances this potential. Hyperfine resolved ultraviolet spectra have been reported to determine the degree of rotational level mixing in the B-state and the efficiency of laser cooling on the B $\leftarrow$ X transition [E. B. Norrgard ${\it et~al.}$, Physical Review A ${\bf 95}$, 062506 (2017)]. Using these high-resolution spectra, the hyperfine structure in the B-state of TlF is re-analysed and the magnitude of the $\Lambda$-doubling in the B-state is discussed.