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Exact quantum defect theory approach for lithium in magnetic fields |
Xu Jia-Kun (徐家坤)a b, Chen Hai-Qing (陈海清)a, Liu Hong-Ping (刘红平)c |
a College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
b School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430073, China;
c State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China |
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Abstract We calculate the diamagnetic spectrum of lithium at highly excited states up to the positive energy range using the exact quantum defect theory approach. The concerned excitation is one-photon transition from the ground state 2s to the highly excited states np with π and σ polarizations respectively. Lithium has a small quantum defect value 0.05 for the np states, and its diamagnetic spectrum is very similar to that of hydrogen in the energy range approaching the ionization limit. However, a careful calculation shows that the spectrum has a significant discrepancy with that of hydrogen when the energy is lower than -70 cm-1. The effect of the quantum defect is also discussed for the Stark spectrum. It is found that the σ transition to the np states in an electric field has a similar hydrogen behavior due to the zero interaction with channel ns.
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Received: 11 May 2012
Revised: 27 May 2012
Accepted manuscript online:
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PACS:
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32.60.+i
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(Zeeman and Stark effects)
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32.30.Jc
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(Visible and ultraviolet spectra)
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31.15.-p
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(Calculations and mathematical techniques in atomic and molecular physics)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174329 and 91121005) and the National Basic Research Program of China (Grant No. 2013CB922003). |
Corresponding Authors:
Liu Hong-Ping
E-mail: liuhongping@wipm.ac.cn
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Cite this article:
Xu Jia-Kun (徐家坤), Chen Hai-Qing (陈海清), Liu Hong-Ping (刘红平) Exact quantum defect theory approach for lithium in magnetic fields 2013 Chin. Phys. B 22 013204
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