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Chin. Phys. B, 2018, Vol. 27(7): 073701    DOI: 10.1088/1674-1056/27/7/073701
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Loss of cold atoms due to collisions with residual gases in free flight and in a magneto-optical trap

Jing-feng Xiang(项静峰)1,2, He-nan Cheng(程鹤楠)1,2, Xiang-kai Peng(彭向凯)1,2, Xin-wen Wang(王新文)1,2, Wei Ren(任伟)1, Jing-wei Ji(吉经纬)1, Kang-kang Liu(刘亢亢)1, Jian-bo Zhao(赵剑波)1, Lin Li(李琳)1, Qiu-zhi Qu(屈求智)1, Tang Li(李唐)1, Bin Wang(汪斌)1, Mei-feng Ye(叶美凤)1, Xin Zhao(赵鑫)1, Yuan-yuan Yao(姚媛媛)1, De-Sheng Lü(吕德胜)1, Liang Liu(刘亮)1
1 Key Laboratory of Quantum Optics and Center of Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  

The loss rate of cold atoms in a trap due to residual gas collisions differs from that in a free state after the cold atoms are released from the trap. In this paper, the loss rate in a cold rubidium-87 atom cloud was measured in a magneto-optical trap (MOT) and during its free flight. The residual gas pressure was analyzed by a residual gas analyzer, and the pressure distribution in a vacuum chamber was numerically calculated by the angular coefficient method. The decay factor, which describes the decay behavior of cold atoms due to residual gas collisions during a free flight, was calculated. It was found that the decay factor agrees well with theoretical predictions under various vacuum conditions.

Keywords:  atom traps      atomic and molecular collision      residual gas  
Received:  26 March 2018      Revised:  23 April 2018      Accepted manuscript online: 
PACS:  37.10.Gh (Atom traps and guides)  
  34.50.Cx (Elastic; ultracold collisions)  
  07.30.Bx (Degasification, residual gas)  
Fund: 

Project supported by the Ministry of Science and Technology of China (Grant No. 2013YQ09094304).

Corresponding Authors:  De-Sheng Lü, Liang Liu     E-mail:  dslv@siom.ac.cn;liang.liu@siom.ac.cn

Cite this article: 

Jing-feng Xiang(项静峰), He-nan Cheng(程鹤楠), Xiang-kai Peng(彭向凯), Xin-wen Wang(王新文), Wei Ren(任伟), Jing-wei Ji(吉经纬), Kang-kang Liu(刘亢亢), Jian-bo Zhao(赵剑波), Lin Li(李琳), Qiu-zhi Qu(屈求智), Tang Li(李唐), Bin Wang(汪斌), Mei-feng Ye(叶美凤), Xin Zhao(赵鑫), Yuan-yuan Yao(姚媛媛), De-Sheng Lü(吕德胜), Liang Liu(刘亮) Loss of cold atoms due to collisions with residual gases in free flight and in a magneto-optical trap 2018 Chin. Phys. B 27 073701

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