Hyperfine Structure of the $B^3{\Pi }_1$ State and Predictions of Optical Cycling Behavior in the $X\to B$ transition of TlF

Abstract

The rotational and hyperfine spectrum of the $X^1{\Sigma }^{+}\to B^3{\Pi }_1$ transition in TlF molecules was measured using laser-induced fluorescence from both a thermal and a cryogenic molecular beam. Rotational and hyperfine constants for the $B$ state are obtained. The large magnetic hyperfine interaction of the Tl nuclear spin leads to significant mixing of the lowest $B$ state rotational levels. Updated, more precise measurements of the $B\to X$ vibrational branching fractions are also presented. The combined rovibrational branching fractions allow for the prediction of the number of photons that can be scattered in a given TlF optical cycling scheme.

15 pages, 6 figures, 6 Tables

References in corpus (2)

• Magneto-optical trapping of a diatomic molecule
• Sub-millikelvin dipolar molecules in a radio-frequency magneto-optical trap

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