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.
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)
作者简介
Corresponding author:汪丽蓉.E-mail:wlr@sxu.edu.cn.
