中国物理B ›› 2022, Vol. 31 ›› Issue (4): 43101-043101.doi: 10.1088/1674-1056/ac29a6

• • 上一篇    下一篇

Theoretical calculation of the quadratic Zeeman shift coefficient of the 3P0o clock state for strontium optical lattice clock

Benquan Lu(卢本全)1, Xiaotong Lu(卢晓同)1, Jiguang Li(李冀光)3, and Hong Chang(常宏)1,2,†   

  1. 1 National Time Service Center, Xi'an 710000, China;
    2 The University of Chinese Academy of Sciences, Beijing 100088, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • 收稿日期:2021-07-19 修回日期:2021-09-18 接受日期:2021-09-24 出版日期:2022-03-16 发布日期:2022-03-10
  • 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), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the West Light Foundation of the Chinese Academy of Sciences (Grant No. XAB2018B17).

Theoretical calculation of the quadratic Zeeman shift coefficient of the 3P0o clock state for strontium optical lattice clock

Benquan Lu(卢本全)1, Xiaotong Lu(卢晓同)1, Jiguang Li(李冀光)3, and Hong Chang(常宏)1,2,†   

  1. 1 National Time Service Center, Xi'an 710000, China;
    2 The University of Chinese Academy of Sciences, Beijing 100088, China;
    3 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
  • Received:2021-07-19 Revised:2021-09-18 Accepted:2021-09-24 Online:2022-03-16 Published:2022-03-10
  • 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), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the West Light Foundation of the Chinese Academy of Sciences (Grant No. XAB2018B17).

摘要: In the weak-magnetic-field approximation, we derived an expression of quadratic Zeeman shift coefficient of $^3P^{\rm o}_0$ clock state for $^{88}$Sr and $^{87}$Sr atoms. By using this formula and the multi-configuration Dirac-Hartree-Fock theory, the quadratic Zeeman shift coefficients were calculated. The calculated values $C_2$ = $-23.38(5)$ MHz/T$^2$ for $^{88}$Sr and the $^3P^{\rm o}_0$, $F = 9/2$, $M_F = \pm9/2$ clock states for $^{87}$Sr agree well with the other available theoretical and experimental values, especially the most accurate measurement recently. In addition, the calculated values of the $^3P^{\rm o}_0$, $F = 9/2$, $M_F = \pm9/2$ clock states were also determined in our $^{87}$Sr optical lattice clock. The consistency with measurements verifies the validation of our calculation model. Our theory is also useful to evaluate the second-order Zeeman shift of the clock transition, for example, the new proposed $^1S_0$, $F = 9/2$, $M_F = \pm5/2$-${}^3P^{\rm o}_0$, $F = 9/2$, $M_F = \pm3/2$ transitions.

关键词: optical lattice clock, quadratic Zeeman shift coefficient, strontium

Abstract: In the weak-magnetic-field approximation, we derived an expression of quadratic Zeeman shift coefficient of $^3P^{\rm o}_0$ clock state for $^{88}$Sr and $^{87}$Sr atoms. By using this formula and the multi-configuration Dirac-Hartree-Fock theory, the quadratic Zeeman shift coefficients were calculated. The calculated values $C_2$ = $-23.38(5)$ MHz/T$^2$ for $^{88}$Sr and the $^3P^{\rm o}_0$, $F = 9/2$, $M_F = \pm9/2$ clock states for $^{87}$Sr agree well with the other available theoretical and experimental values, especially the most accurate measurement recently. In addition, the calculated values of the $^3P^{\rm o}_0$, $F = 9/2$, $M_F = \pm9/2$ clock states were also determined in our $^{87}$Sr optical lattice clock. The consistency with measurements verifies the validation of our calculation model. Our theory is also useful to evaluate the second-order Zeeman shift of the clock transition, for example, the new proposed $^1S_0$, $F = 9/2$, $M_F = \pm5/2$-${}^3P^{\rm o}_0$, $F = 9/2$, $M_F = \pm3/2$ transitions.

Key words: optical lattice clock, quadratic Zeeman shift coefficient, strontium

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)