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

作　　者：汪丽蓉 姬中华 元晋鹏 杨艳 赵延霆 马杰 肖连团 贾锁堂 

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Laser Spectroscopy Laboratory,Shanxi University

出　　处：《Chinese Physics B》2012年第11期179-183,共5页中国物理B（英文版）

基　　金：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);the Natural Science Foundation of Shanxi Province,China (Grant No. 2011011004)

摘　　要：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.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.

关 键 词：cold atom dark magneto-optical trap PHOTOASSOCIATION 

分 类 号：O561[理学—原子与分子物理]