High Resolution Laser Excitation Spectra and Franck-Condon Factors of A^(2)Π-X^(2)∑^(+) Electronic Transition of MgF  

MgF自由基A^(2)Π-X^(2)∑^(+)跃迁的高分辨激光诱导荧光光谱和Franck-Condon因子

作　　者：Jingwang Gu Zengjun Xiao Chunting Yu Qiang Zhang Yang Chen Dongfeng Zhao 顾景旺;肖增军;余春婷;张强;陈旸;赵东锋(中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,合肥230026)

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale,Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2022年第1期58-68,I0062,共12页化学物理学报（英文）

基　　金：supports from the National Natural Science Foundation of China(No.21773221 and No.21827804);the National Key R&D Program of China(No.2017YFA0303502);the Fundamental Research Funds for the Central Universities of China(No.WK2340000078)。

摘　　要：Magnesium monofluoride(MgF)is proposed as an ideal candidate radical for direct laser cooling.Here,the rotationally resolved laser spectra of MgF for the A^(2)Π-X^(2)∑^(+) electronic transition system were recorded by using laser induced fluorescence technique.The MgF radicals were produced by discharging SF_(6)/Ar gas mixtures between the tips of two magnesium needles in a supersonic jet expansion.We recorded a total of 19 vibrational bands belonging to three sequences of Δv=0,±1 in the region of 348-370 nm.Accurate spectroscopic constants for both X^(2)∑^(+) and A^(2)Π states are determined from rotational analysis of the experimental spectra.Spectroscopic parameters,including the Franck-Condon factors(FCFs),are determined from the experimental results and the Rydberg-Klein-Rees(RKR)calculations.Significant discrepancies between the experimentally measured and RKR-calculated FCFs are found,indicating that the FCFs are nearly independent of the spin-orbit coupling in the A^(2)Π state.Potential energy curves(PECs)and FCFs determined here provide necessary data for the theoretical simulation of the laser-cooling scheme of MgF.

关 键 词：Magnesium monofluoride Laser induced fluorescence Rotationally resolved spectra Franck-Condon factor 

分 类 号：O657.3[理学—分析化学] O641.1[理学—化学]