Exact quantum defect theory approach for lithium in magnetic fields |
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Authors: | Xu Jia-Kun ab Chen Hai-Qing a Liu Hong-Ping |
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Affiliation: | 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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Keywords: | diamagnetic spectrum quantum defect theory |
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