Investigation of ultracold atoms and molecules in a dark magneto-optical trap

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 populatio...

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Bibliographic Details
Published in:Chinese physics B 2012-11, Vol.21 (11), p.179-183
Main Author: 汪丽蓉 姬中华 元晋鹏 杨艳 赵延霆 马杰 肖连团 贾锁堂
Format: Article
Language:English
Subjects:
Cesium
Cold atoms
Collision rates
Density
Ground state
MOT
s-1
Vibrational spectra
振动光谱
碰撞率
磁光阱
超冷原子
超精细
铯分子
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Summary: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.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/21/11/113402