Saturated absorption spectroscopy of buffergas-cooled Barium monofluoride molecules

作     者：Wenhao Bu Yuhe Zhang Qian Liang Tao Chen Bo Yan Wenhao Bu;Yuhe Zhang;Qian Liang;Tao Chen;Bo Yant

作者机构：Interdisciplinary Center of Quantum InformationState Key Laboratory of Modern Optical Instrumentationand Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics DepartmentZhejiang UniversityHangzhou 310027China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2022年第17卷第6期

页      面：185-191页

核心收录：

学科分类：07[理学] 070302[理学-分析化学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：support from the National Key Research and Development Program of China under Grant No.2018YFA0307200 the National Natural Science Foundation of China under Grant Nos.U21A20437 and 12074337 the Natural Science Foundation of Zhejiang Province under Grant No.LR21A040002 Zhejiang Province Plan for Science and technology No.2020C01019 the Fundamental Research Funds for the Central Universities under No.2021FZZX001-02. 

主　　题：cold molecule saturated spectroscopy buffer gas cooling BaF 

摘      要：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^(2)Π_(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.