Experimental study of cesium 5D+5D→6S+(nL=9D,11S,7F)energy pooling collisions

作     者：王倩 戴康 沈异凡 

作者机构：School of Science Xi'an Jiaotong UniversityXi'an 710049 Department of PhysicsXinjiang UniversityUrumqi 830046 Department of Physics Xinjiang UniversityUrumqi 830046 

出 版 物：《Chinese Optics Letters》 (中国光学快报（英文版）)

年 卷 期：2007年第5卷第7期

页      面：376-378页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：This work was supported by the National Science Foundation of China under Grant No.10264004 

主　　题：nL=9D,11S,7F)energy pooling collisions Experimental study of cesium 5D+5D nL rate 几几 

摘      要：We report experimentally the measured rate coefficients for the energy pooling （EP） collisions process Cs（5D） ＋Cs（5D） →Cs（6S）＋Cs（nL = 9D, 11S, 7F） in cesium densities of 1016 -1017 cm^-3. The 5D state was populated via 8S →7P→ 5D spontaneous emission following two-step pumping 6S → 6P3/2→ 8S. Since the 5D → 6P （3.0-3.6 μm） fluorescence could not be detected in this experiment, we carried out a relative measurement for the process 6P W 5D → 6S W 7D. The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode laser beam, tuned to 6P3/2→9S1/2 transition, which could be translated parallelly to the pump beam. The excited atom densities have been combined with the measured fluorescence ratios to yield EP rate coefficients. The average values for nL = 9D, 11S and 7F are 8.0 ± 4.0, 7.0 ± 3.5, and 9.3 ± 4.6 （in units of 10^-10cm^3/s）, respectively. Influence of the energy transfer process 11S ＋ 6S ←→7F ＋ 6S on the rate coefficients k11s and k7F is also discussed.