Precision calculation of fine structure in helium and Li

The fine structure constant α can be extracted from high-precision spectroscopy of the 2^3 P J fine structure splittings in helium and light helium-like ions. In this work, the 2^3 P J fine structure splittings of helium and Li^＋ ion are calculated,including relativistic and QED corrections of order...

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Published in:Chinese physics B 2015-03, Vol.24 (3), p.111-117
Main Author: 张佩佩 钟振祥 严宗朝 史庭云
Format: Article
Language:English
Subjects:
Constants
Fine structure
Helium
Mathematical analysis
Operators
QED
Spectroscopy
Splitting
氦
物理学
相对论
精细结构常数
计算
锂
高精度
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description The fine structure constant α can be extracted from high-precision spectroscopy of the 2^3 P J fine structure splittings in helium and light helium-like ions. In this work, the 2^3 P J fine structure splittings of helium and Li^＋ ion are calculated,including relativistic and QED corrections of order mα^4, mα^4（m/M）, mα^5, mα^5（m/M）, and Douglas–Kroll operators of mα^6 and mα^6（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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source Institute of Physics
subjects Constants
Fine structure
Helium
Mathematical analysis
Operators
QED
Spectroscopy
Splitting
氦
物理学
相对论
精细结构常数
计算
锂
高精度
title Precision calculation of fine structure in helium and Li
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