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We reported a detailed experimental study of the cold collision of Bariummonofluoride (BaF) with buffer gas and the high-resolution spectroscopyrelevant with direct laser cooling. BaF molecules are efficiently produced withlaser ablation and buffer-gas cooled in a cryogenic apparatus. The lasercooling relevant transition $|X^2\Sigma, v=0, N=1\rangle$ to $|A^2\Pi, v'=0,J'=1/2\rangle$ is identified. The collision cross section with buffer gas ismeasured to be $1.4(7)\times10^{-14} cm^{-2}$, which is very suitable forbuffer gas cooling. Both rotational and vibrational temperatures areeffectively cooled, and large mount of molecules are quenched into the desiredstates. Our study provides an important benchmark for further laser cooling ofBaF molecule.

Cold collision and high-resolution spectroscopy of buffer gas cooled BaF Molecule