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Investigation of ultracold atoms and molecules in a dark magneto-optical trap |
| Wang Li-Rong, Ji Zhong-Hua, Yuan Jin-Peng, Yang Yan, Zhao Yan-Ting, Ma Jie, Xiao Lian-Tuan, Jia Suo-Tang |
| State Key Laboratory of Quantum Optics and Quantum Optics Devices, Laser Spectroscopy Laboratory, Shanxi University, Taiyuan 030006, China |
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Abstract In this paper, ultracold atoms and molecules in a dark magneto-optical trap (MOT) are studied via depumping the cesium cold atoms into the dark hyperfine ground state. The collision rate is reduced to 0.45 s-1 and the density of the atoms is increased to 5.6× 1011 cm-3 when the fractional population of the atoms in the bright hyperfine ground state is as low as 0.15. The vibrational spectra of the ultracold cesium molecules are also studied in a standard MOT and in a dark MOT separately. The experimental results are analyzed by using the perturbative quantum approach.
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Received: 20 March 2012
Revised: 23 May 2012
Published: 01 October 2012
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PACS:
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34.50.Cx
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(Elastic; ultracold collisions)
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37.10.Gh
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(Atom traps and guides)
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33.15.Mt
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(Rotation, vibration, and vibration-rotation constants)
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33.80.-b
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(Photon interactions with molecules)
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2012CB921603), the International Science & Technology Cooperation Program of China (Grant No. 2011DFA12490), the National Natural Science Foundation of China (Grant Nos. 10934004, 60978001, 60978018, 60808009, 61078001, and 61008012), and the Natural Science Foundation of Shanxi Province, China (Grant No. 2011011004). |
Corresponding Authors:
Wang Li-Rong
E-mail: wlr@sxu.edu.cn
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Cite this article:
Wang Li-Rong, Ji Zhong-Hua, Yuan Jin-Peng, Yang Yan, Zhao Yan-Ting, Ma Jie, Xiao Lian-Tuan, Jia Suo-Tang Investigation of ultracold atoms and molecules in a dark magneto-optical trap 2012 Chin. Phys. B 21 113402
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