Saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride molecules release_qxbqaivopfcelhyrkpq4axwqwm

by Wenhao Bu and Yuhe Zhang and Qian Liang and Tao Chen and Bo Yan

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2022  

Abstract

We report an experimental investigation on the Doppler-free saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride (BaF) molecules in a 4 K cryogenic cell. The obtained spectra with a resolution of 19 MHz, much smaller than previously observed in absorption spectroscopy, clearly resolve the hyperfine transitions. Moreover, we use these high-resolution spectra to fit the hyperfine splittings of excited A(v=0) state and find the hyperfine splitting of the laser-cooling-relevant A^2Π_1/2(v=0, J=1/2, +) state is about 18 MHz, much higher than the previous theoretically predicted value. This provides important missing information for laser cooling of BaF molecules.
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Date   2022-02-05
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arXiv  2202.02463v1
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