Probing atomic and nuclear properties with precision spectroscopy of fine and hyperfine structures in the Li+7 ion

作     者：Hua Guan Shaolong Chen Xiao-Qiu Qi Shiyong Liang Wei Sun Pengpeng Zhou Yao Huang Pei-Pei Zhang Zhen-Xiang Zhong Zong-Chao Yan G. W. F. Drake Ting-Yun Shi Kelin Gao 

作者机构：State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan 430071 China University of Chinese Academy of Sciences Beijing 100049 China Department of Physics University of Windsor Windsor Ontario Canada N9B 3P4 Department of Physics University of New Brunswick Fredericton New Brunswick Canada E3B 5A3 Center for Cold Atom Physics Chinese Academy of Sciences Wuhan 430071 China 

出 版 物：《Physical Review A》 (Phys. Rev. A)

年 卷 期：2020年第102卷第3期

页      面：030801(R)-030801(R)页

核心收录：

基　　金：CAS-SAFEA International Partnership Program for Creative Research Teams Chinese Academy of Sciences, CAS, (XDB21010400, YZ201552, XDB21020200) Youth Innovation Promotion Association of the Chinese Academy of Sciences, (Y201963, 2017380, 2018364) Hubei Province Science Fund for Distinguished Young Scholars, (2017CFA040) National Natural Science Foundation of China, NSFC, (11604369, 11974382, 91636216, 11774386, 11622434, 11934014) 

主　　题：Electronic structure of atoms & molecules Electronic transitions Fine & hyperfine structure Relativistic & quantum electrodynamic effects in atoms, molecules,& ions 

摘      要：Precision spectroscopy of Li+ is a promising testing ground for bound-state quantum electrodynamics (QED) and for measurements of nuclear properties such as the Zemach radius. We investigate the hyperfine and fine-structure splittings of the 2S13 and 23PJ states of Li+7 using saturated fluorescence spectroscopy based on a ∼460eV metastable ion beam. We measure in particular the 2S13–2PJ3 transitions in Li+7. With a triple nested loop scanning method, the long-term drift and systematic uncertainties are reduced or eliminated, resulting in a total uncertainty of less than 100 kHz. Our results are in good agreement with QED calculations. For the hyperfine splittings of 2S13, our measured values have a similar accuracy to previous measurements and theoretical calculations. For the 23PJ fine and hyperfine splittings, our measured results are one order of magnitude more accurate than those of previous measurements and have a similar accuracy to the theoretical values. The measurements lay the foundation for future work on the Li+ isotopes and their theoretical interpretation in terms of nuclear charge radii and the Zemach radii.