Buffer-gas cooling, high-resolution spectroscopy and optical cycling of barium monofluoride molecules

Abstract

We demonstrate buffer-gas cooling, high-resolution spectroscopy and cycling fluorescence of cold barium monofluoride (BaF) molecules. Our source produces an intense and internally cold molecular beam containing the different BaF isotopologues with a mean forward velocity of 190 m/s. For a well-collimated beam of 138BaF we observe a flux of more than 1e10 molecules/sr/pulse in the X2Sigma, N=1 state in our downstream detection region. Studying the absorption line strength of the intermediate A'Delta state we infer a lifetime of 790+\-346 ns, significantly longer than previously estimated. Finally, highly-diagonal Franck-Condon factors and magnetic remixing of dark states allow us to realize a quasi-cycling transition in 138BaF that is suitable for future laser cooling of this heavy diatomic molecule.

arXiv comment11 pages, 7 figures

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• Multivalent optical cycling centers in polyatomic molecules
• Fast and High-Yield Loading of a D${}_2$ MOT of Potassium from a Cryogenic Buffer Gas Beam
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• Optimizing Pulsed-Laser Ablation Production of AlCl Molecules for Laser Cooling
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