Spectroscopic Characterization of Buffer-Gas-Cooled Lead Monofluoride Molecules in the B2σ+(Υ'=0) ← X12π1/2(Υ=0) Transition

作     者：Wang, Zesen Pang, Renjun Ma, Jie Lin, Qinning Hou, Shunyong Wang, Hailing Li, Xiaohu Xu, Liang Li, Xinjia Chen, Guanglong Liu, Jinjun Yin, Jianping Yang, Tao 

作者机构：State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200062 China Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1 − Street Urumqi Xinjiang830011 China Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China School of Mathematics Physics and Statistics Shanghai University of Engineering Science Shanghai201620 China Department of Chemistry Department of Physics University of Louisville LouisvilleKY40292 United States Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Molecules 

摘      要：The nonzero measurement of the electron s Electric Dipole Moment (eEDM) has long been a fundamental pursuit in atomic, molecular and optical physics, offering possible insights into new physics beyond the Standard Model. In this regard, lead monofluoride (PbF) has emerged as a potential candidate for measuring eEDM primarily due to its suitable properties such as the strong internal effective electric field, and eEDM-sensitive ground state with large Ω-doubling and small magnetic g factor. In this article, we realize the production of a buffer-gas-cooled PbF molecular beam and characterize its high-resolution spectroscopy in the B2Σ+(υ =0) ← X12Π1/2(υ=0) transition, including both direct absorption and laser-induced fluorescence spectroscopy. A highly concentrated beam of PbF molecules is obtained at its central forward velocity of 223 ± 17 m/s, while 81, 66 and 24 hyperfine-resolved spectral lines with an accuracy of 40 MHz have been assigned respectively for 208PbF, 207PbF and 206PbF isotopologues. The hyperfine constants (Frosch and Foley parameters) due to the 19F nucleus (b1 and c1) of the B state are reported for the first time, and those owing to the 207Pb nucleus (b2 and c2) have been also updated. Such a cryogenic molecular beam of PbF in association with its hyperfine-resolved spectral atlas of B2Σ+(υ =0) ← X12Π1/2(υ=0) will be essential in developing sensitive detection schemes towards the eEDM measurement. © 2024, The Authors. All rights reserved.