Fine and hyperfine interactions of PbF studied by laser-induced fluorescence spectroscopy

作者：Zhu, Chengcheng; Wang, Hailing^*; Chen, Ben; Chen, Yini; Yang, Tao; Yin, Jianping^*; Liu, Jinjun

来源：Journal of Chemical Physics, 2022, 157(8): 084307.

DOI：10.1063/5.0099716

• P-ODD
• SPECTRA
• STATES

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 SF6. The LIF excitation spectrum of the (0, 0) band in the B-2 Sigma(+)-X-2 Pi(1/2) system of the (PbF)-Pb-208, (PbF)-Pb-207, and (PbF)-Pb-206 isotopologues has been recorded with rotational, fine structure, and hyperfine-structure resolution. Transitions in the LIF spectrum were assigned and combined with the previous X-2 Pi(3/2)-X-2 Pi(1/2) emission spectrum in the near-infrared region [Ziebarth et al., J. Mol. Spectrosc. 191, 108-116 (1998)] and the X-2 Pi(1/2) 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 (X-2 Pi(1/2)) and the excited (B-2 Sigma(+)) electronic states. Molecular constants determined in the present work are compared with previously reported values. Particularly, the significance of the hyperfine parameters, A(perpendicular to) and A, of Pb-207 is discussed.