存在缓冲气体的Cs蒸气中的三体碰撞(英文)  

Three-body Collisions in Cesium Vapour in the Presence of Buffer Gas

作　　者：张刚台[1] 袁强华[1] 崔秀花[1] 穆保霞[1] 王淑英[1] 戴康[1] 沈异凡[1] 

机构地区：[1]新疆大学物理系,新疆乌鲁木齐830046

出　　处：《新疆大学学报（自然科学版）》2006年第3期303-307,共5页Journal of Xinjiang University(Natural Science Edition)

基　　金：Supported by the National Science Fundation of China under No.10264004

摘　　要：研究了Cs（6P3/2）＋Cs（6P3／2）＋He→Cs（nlJ=8S1/2，4F5／2、4F7/2）＋Cs（651/2）＋He的碰撞能量转移过程．在温度为330-340K，单模半导体激光器共振激发Cs原子至6P2/3态，利用另一与泵浦激光束反向平行激光束作为吸收线探测6P3/2态原子密度及其空间分布．缓冲气体增大了两个6P3/2原子间的能量转移，这可从测量庄两个Cs（6P3/2）原子碰撞而被布居的nlJ态所发射的荧光得到证实．三体碰撞速率系数分别为（1．80±0．72）×10^27cm^6s^-1，（1．28±0．51）×10^-27cm^6s^-1、（2．23±0．89）×10^27cm^6s^-1．An experimental study of energy transfer collisions, Cs （6P3/2） ＋ Cs （6P3/2） ＋ He → Cs （nlJ） ＋ Cs （651/2）＋He where nlJ = 851/2,4F5/2 or 4F7/z ,in the range 330K to 340K,been carried out in a cell. Atoms were excited to the 6P3/2 state using a single-mode diode laser. The Cs （6P3/2） atom density and spatial distribution were mapped by monitoring the absorbion of a counterpropagating laser beam. The buffer gas enhanced the energy transfer between two 6P3/2 ,which was based on the measurement of the fluorescence from the nlJ states populated by three-body collision. The three-body collision rate coefficients（in units of 10^-27cm^6 s^-1） for 8 S1/2, 4F5/2 and 4F7/2 are 1.80±0. 72,1.28±0. 51 and 2.23±0. 89,respectively.

关 键 词：三体碰撞 荧光 CS HE 速率系数 

分 类 号：O562.5[理学—原子与分子物理]