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Recombination during expansion of ultracold plasma |
| Zhao Jian-Ming(赵建明)†, Zhang Lin-Jie(张临杰), Feng Zhi-Gang(冯志刚), Li Chang-Yong(李昌勇), and Jia Suo-Tang(贾锁堂) |
| State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China |
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Abstract Signals of ultracold plasma are observed by two-photon ionization of laser-cooled caesium atoms in a magneto-optical trap. Recombination of ions and electrons into Rydberg atoms during the expansion of ultracold plasma is investigated by using state-selective field ionization spectroscopy. The dependences of recombination on initial electron temperature (1--70 K) and initial ion density ($ \sim $10$^{10}$ cm$^{ - 3})$ are investigated. The measured dependence on initial ion density is $N^{1.547\pm 0.004}$ at a delay time of 5 $\mu $s. The recombination rate rapidly declines as initial electron temperature increases when delay time is increased. The distributions of Rydberg atoms on different values of principal quantum number $n$, i.e. $n=30$--60, at an initial electron temperature of 3.3 K are also investigated. The main experimental results are approximately explained by the three-body recombination theory.
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Received: 24 June 2009
Revised: 28 August 2009
Accepted manuscript online:
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PACS:
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37.10.De
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(Atom cooling methods)
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32.80.Fb
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(Photoionization of atoms and ions)
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| Fund: Project supported by the National
Basic Research Program of China (Grant No.~2006CB921603), the
National Natural Science Foundation of China (Grant Nos.~60978018,
60978001, 10934004 and 60778008), and the Foundation of the Ministry
of Education of China a |
Cite this article:
Zhao Jian-Ming(赵建明), Zhang Lin-Jie(张临杰), Feng Zhi-Gang(冯志刚), Li Chang-Yong(李昌勇), and Jia Suo-Tang(贾锁堂) Recombination during expansion of ultracold plasma 2010 Chin. Phys. B 19 043202
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