中国物理B ›› 2023, Vol. 32 ›› Issue (1): 13101-013101.doi: 10.1088/1674-1056/ac90b0

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Theoretical calculations on Landé $g$-factors and quadratic Zeeman shift coefficients of $n$s$n$p $^{3} {P}^{o}_{0}$ clock states in Mg and Cd optical lattice clocks

Benquan Lu(卢本全)1 and Hong Chang(常宏)1,2,†   

  1. 1 National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China;
    2 The University of Chinese Academy of Sciences, Beijing 100088, China
  • 收稿日期:2022-07-13 修回日期:2022-08-29 接受日期:2022-09-09 出版日期:2022-12-08 发布日期:2022-12-23
  • 通讯作者: Hong Chang E-mail:changhong@ntsc.ac.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61775220), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100), and the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004).

Theoretical calculations on Landé $g$-factors and quadratic Zeeman shift coefficients of $n$s$n$p $^{3} {P}^{o}_{0}$ clock states in Mg and Cd optical lattice clocks

Benquan Lu(卢本全)1 and Hong Chang(常宏)1,2,†   

  1. 1 National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China;
    2 The University of Chinese Academy of Sciences, Beijing 100088, China
  • Received:2022-07-13 Revised:2022-08-29 Accepted:2022-09-09 Online:2022-12-08 Published:2022-12-23
  • Contact: Hong Chang E-mail:changhong@ntsc.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61775220), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100), and the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004).

摘要: The study of magnetic field effects on the clock transition of Mg and Cd optical lattice clocks is scarce. In this work, the hyperfine-induced Landé $g$-factors and quadratic Zeeman shift coefficients of the ${n{\rm s}n{\rm p}}$ $^3P^{\rm o}_0$ clock states for $^{111,113}$Cd and $^{25}$Mg were calculated by using the multi-configuration Dirac-Hartree-Fock theory. To obtain accurate values of these parameters, the impact of electron correlations and furthermore the Breit interaction and quantum electrodynamical effects on the Zeeman and hyperfine interaction matrix elements, and energy separations were investigated in detail. We also estimated the contributions from perturbing states to the Landé $g$-factors and quadratic Zeeman shift coefficients concerned so as to truncate the summation over the perturbing states without loss of accuracy. Our calculations provide important data for estimating the first- and second-order Zeeman shifts of the clock transition for the Cd and Mg optical lattice clocks.

关键词: optical lattice clock, hyperfine-induced Landé, g-factor, quadratic Zeeman shift coefficient, Mg and Cd

Abstract: The study of magnetic field effects on the clock transition of Mg and Cd optical lattice clocks is scarce. In this work, the hyperfine-induced Landé $g$-factors and quadratic Zeeman shift coefficients of the ${n{\rm s}n{\rm p}}$ $^3P^{\rm o}_0$ clock states for $^{111,113}$Cd and $^{25}$Mg were calculated by using the multi-configuration Dirac-Hartree-Fock theory. To obtain accurate values of these parameters, the impact of electron correlations and furthermore the Breit interaction and quantum electrodynamical effects on the Zeeman and hyperfine interaction matrix elements, and energy separations were investigated in detail. We also estimated the contributions from perturbing states to the Landé $g$-factors and quadratic Zeeman shift coefficients concerned so as to truncate the summation over the perturbing states without loss of accuracy. Our calculations provide important data for estimating the first- and second-order Zeeman shifts of the clock transition for the Cd and Mg optical lattice clocks.

Key words: optical lattice clock, hyperfine-induced Landé, g-factor, quadratic Zeeman shift coefficient, Mg and Cd

中图分类号:  (Relativistic corrections, spin-orbit effects, fine structure; hyperfine structure)

  • 31.15.aj
31.15.vj (Electron correlation calculations for atoms and ions: excited states) 32.60.+i (Zeeman and Stark effects) 95.55.Sh (Auxiliary and recording instruments; clocks and frequency standards)