Precise determination of ground-state hyperfine splitting and calculation of Zeeman coefficients for 171Yb+ microwave frequency standard

作     者：Han, Jize Z. Lu, B.Q. Xin, N.C. Yu, Y.M. Qin, H.R. Chen, S.T. Zheng, Y. Li, J.G. Zhang, J.W. Wang, L.J. 

作者机构：State Key Laboratory of Precision Measurement Technology and Instruments Key Laboratory of Photon Measurement and Control Technology of Ministry of Education Department of Precision Instrument Tsinghua University Beijing100084 China National Time Service Center Chinese Academy of Sciences Xi’an710600 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Department of Physics Tsinghua University Beijing100084 China Institute of Applied Physics and Computational Mathematics Beijing100088 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2023年

核心收录：

主　　题：Frequency standards 

摘      要：We report precise measurement of the hyperfine splitting and calculation of the Zeeman coefficients of the 171Yb+ ground state. The absolute hyperfine splitting frequency is measured using high-resolution laser-microwave double-resonance spectroscopy at 0.1 mHz level, and evaluated using more accurate Zeeman coefficients. These Zeeman coefficients are derived using Landé gJ factors calculated by two atomic-structure methods, multiconfiguration Dirac-Hartree-Fock, and multireference configuration interaction. The cross-check of the two calculations ensures an accuracy of the Zeeman coefficients at 10−2 Hz/G2 level. The results provided in this paper improve the accuracy and reliability of the second-order Zeeman shift correction, thus further improving the accuracy of the microwave frequency standards based on 171Yb+. The high-precision hyperfine splitting and Zeeman coefficients could also support could also support further experiments to improve the constraints of fundamental constants through clock frequency comparison of the Yb+ system. © 2023, CC BY.