Zhu Chengcheng, Wang Hailing, Chen Ben, Chen Yini, Yang Tao, Yin Jianping, Liu Jinjun
State Key Laboratory of Precision Spectroscopy, East China Normal University, 500 Dongchuan Road, Minhang District, 200241 Shanghai, People's Republic of China.
Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, USA.
J Chem Phys. 2022 Aug 28;157(8):084307. doi: 10.1063/5.0099716.
The fine and hyperfine interactions in PbF have been studied using the laser-induced fluorescence (LIF) spectroscopy method. Cold PbF molecular beam was produced by laser-ablating a Pb rod under jet-cooled conditions, followed by the reaction with SF. The LIF excitation spectrum of the (0, 0) band in the BΣ-XΠ system of the PbF, PbF, and PbF isotopologues has been recorded with rotational, fine structure, and hyperfine-structure resolution. Transitions in the LIF spectrum were assigned and combined with the previous XΠ-XΠ emission spectrum in the near-infrared region [Ziebarth et al., J. Mol. Spectrosc. 191, 108-116 (1998)] and the XΠ state pure rotational spectrum of PbF [Mawhorter et al., Phys. Rev. A 84, 022508 (2011)] in a global fit to derive the rotational, spin-orbit, spin-rotation, and hyperfine interaction parameters of the ground (XΠ) and the excited (BΣ) electronic states. Molecular constants determined in the present work are compared with previously reported values. Particularly, the significance of the hyperfine parameters, A and A, of Pb is discussed.
