Research on ultracold cesium molecule long-range states by high-resolution photoassociative spectroscopy  

作　　者：WANG LiRong MA Jie JI WeiBang WANG GuiPing XIAO LianTuan JIA SuoTang 

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,College of Physics and Electronics Engineering,Shanxi University,Taiyuan 030006,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2008年第2期147-156,共10页中国科学：物理学、力学、天文学（英文版）

基　　金：973 Program of China (Grant. No. 2006CB921603);the National Natural Science Foundation of China (Grant Nos. 10574084, 60678003, and 60778008);the Special Foundation for State Major Basic Research Program of China (Grant No. 2005CCA06300);the Youth Science Foundation of Shanxi Province of China (Grant No. 20041013)

摘　　要：In this paper, an ultra-high resolution photoassociation spectroscopy study on photoassociation of cesium atoms is reported. The cold cesium gas in the mag-neto-optical trap is illuminated by a photoassociation laser with red-tuning as large as 40 cm?1 below the 6S1/2 + 6P3/2 dissociation limit, and the photoassociation to the excited state ultracold molecule is detected. High signal-to-noise ratio is obtained by using the lock-in detection of the fluorescence from the modulated cold Cs at-oms. The 0g?, 1g and 0u+ long-range states which correspond to 6S1/2 + 6P3/2 dissocia-tion limit are present in the photoassociation spectrum. The effective coefficients of leading long-range interactions and the corresponding vibrational quantum num-ber are obtained using LeRoy-Bernstein Law. It is found that photoassociation process creates rotating molecules and the high J value is a hint that higher partial waves participate in the PA process in the presence of trapping laser.In this paper, an ultra-high resolution photoassociation spectroscopy study on photoassociation of cesium atoms is reported. The cold cesium gas in the magneto-optical trap is illuminated by a photoassociation laser with red-tuning as large as 40 cm?1 below the 6S 1/2 + 6P 3/2 dissociation limit, and the photoassociation to the excited state ultracold molecule is detected. High signal-to-noise ratio is obtained by using the lock-in detection of the fluorescence from the modulated cold Cs atoms. The 0 g ? , 1g and 0 u + long-range states which correspond to 6S 1/2 + 6P 3/2 dissociation limit are present in the photoassociation spectrum. The effective coefficients of leading long-range interactions and the corresponding vibrational quantum number are obtained using LeRoy-Bernstein Law. It is found that photoassociation process creates rotating molecules and the high J value is a hint that higher partial waves participate in the PA process in the presence of trapping laser.

关 键 词：ULTRACOLD MOLECULE PHOTOASSOCIATION HIGH-RESOLUTION spectrum 

分 类 号：O561.3[理学—原子与分子物理]