Saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride molecules
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by
Wenhao Bu and Yuhe Zhang and Qian Liang and Tao Chen and Bo Yan
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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