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Precision calculation of fine structure in helium and Li+ |
| Zhang Pei-Pei (张佩佩)a b, Zhong Zhen-Xiang (钟振祥)a, Yan Zong-Chao (严宗朝)a c, Shi Ting-Yun (史庭云)a |
a Division of Theoretical and Interdisciplinary Research, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, and Center for Cold Atom Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
b University of Chinese Academy of Sciences, Beijing 100049, China;
c Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada |
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Abstract The fine structure constant α can be extracted from high-precision spectroscopy of the 23PJ fine structure splittings in helium and light helium-like ions. In this work, the 23PJ fine structure splittings of helium and Li+ ion are calculated, including relativistic and QED corrections of order mα4, mα4(m/M), mα5, mα5(m/M), and Douglas-Kroll operators of mα6 and mα6(m/M), which provide an independent verification for the previous calculations performed by Drake [Can. J. Phys. 80 1195 (2002)] and by Pachucki and Yerokhin [Phys. Rev. A 79 062516 (2009); Phys. Rev. Lett. 104 070403 (2010); Can. J. Phys. 89 1139 (2011)]. The results of the three groups agree with each other.
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Received: 24 April 2014
Revised: 23 June 2014
Accepted manuscript online:
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PACS:
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31.15.ac
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(High-precision calculations for few-electron (or few-body) atomic systems)
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37.10.De
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(Atom cooling methods)
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31.15.ap
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(Polarizabilities and other atomic and molecular properties)
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31.15.bw
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(Coupled-cluster theory)
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB832803). |
Corresponding Authors:
Zhong Zhen-Xiang
E-mail: zxzhong@wipm.ac.cn
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Cite this article:
Zhang Pei-Pei (张佩佩), Zhong Zhen-Xiang (钟振祥), Yan Zong-Chao (严宗朝), Shi Ting-Yun (史庭云) Precision calculation of fine structure in helium and Li+ 2015 Chin. Phys. B 24 033101
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