• Photonics Research
  • Vol. 13, Issue 1, 201 (2025)
Peng-Peng Zhou1,2,†, Shao-Long Chen1,3,†, Cheng-Gang Qin4, Xu-Rui Chang1,5..., Zhi-Qiang Zhou1,5, Wei Sun1,6, Yao Huang1,3, Ke-Lin Gao1,3,8,* and Hua Guan1,3,7,9,*|Show fewer author(s)
Author Affiliations
  • 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
  • 2Information Engineering University, Zhengzhou 450001, China
  • 3Key Laboratory of Time Reference and Applications, Chinese Academy of Sciences, Wuhan 430206, China
  • 4MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
  • 5University of Chinese Academy of Sciences, Beijing 100049, China
  • 6Key Laboratory of Green and High-end Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
  • 7Wuhan Institute of Quantum Technology, Wuhan 430206, China
  • 8e-mail: klgao@wipm.ac.cn
  • 9e-mail: guanhua@wipm.ac.cn
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    DOI: 10.1364/PRJ.538659 Cite this Article Set citation alerts
    Peng-Peng Zhou, Shao-Long Chen, Cheng-Gang Qin, Xu-Rui Chang, Zhi-Qiang Zhou, Wei Sun, Yao Huang, Ke-Lin Gao, Hua Guan, "Precise spectroscopy of metastable Li+ using the optical Ramsey technique in support of time dilation tests," Photonics Res. 13, 201 (2025) Copy Citation Text show less

    Abstract

    Time dilation constitutes a crucial aspect of Lorentz invariance within special relativity and undergoes constant scrutiny through numerous Ives-Stilwell-type experiments employing the Doppler effect. In our study, we employed optical Ramsey spectroscopy on a Li+ ion beam to enhance the precision of measuring the intrinsic transition frequency 23S1-23P2 to the level of four parts in 1010 with speed of 0.00035c. Our findings reconciled an existing 2 MHz disparity between collinear and perpendicular laser spectroscopy. Furthermore, in conjunction with previous studies on Li+ ion beams traveling at speeds of 0.064c and 0.338c [Nat. Phys.3, 861 (2007)NPAHAX1745-247310.1038/nphys778; Phys. Rev. Lett.113, 120405 (2014)PRLTAO0031-900710.1103/PhysRevLett.113.120405], we updated the Robertson-Mansouri-Sexl parameter α^ to be (-10.0±9.9)×10-8 and (-2.9±2.0)×10-8, respectively.
    νaνpν021+2α^β2.

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    νsd=EeVq2mc2ν0,

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    α^νa(1)νp(2)ν1ν21β2,

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    bb*=Ae2iΩT+B,(A1)

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    δν=ϵ22[α1+3ML2L(L+1)L(2L1)α1(T)],(A2)

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    Peng-Peng Zhou, Shao-Long Chen, Cheng-Gang Qin, Xu-Rui Chang, Zhi-Qiang Zhou, Wei Sun, Yao Huang, Ke-Lin Gao, Hua Guan, "Precise spectroscopy of metastable Li+ using the optical Ramsey technique in support of time dilation tests," Photonics Res. 13, 201 (2025)
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