存在缓冲气体的Cs蒸气中的三体碰撞  

Three-body collisions in cesium vapour in the presence of buffer gas

作　　者：张刚台[1] 白婷婷[2] 张美光[1] 

机构地区：[1]宝鸡文理学院物理系,宝鸡721007 [2]宝鸡文理学院数学系,宝鸡721007

出　　处：《原子与分子物理学报》2008年第4期907-910,共4页Journal of Atomic and Molecular Physics

基　　金：宝鸡文理学院科研基金(Zk0698)

摘　　要：本文研究了Cs（6P3/2）＋Cs（6P3/2）＋He→Cs（4FJ）＋Cs（6S1/2）＋He的碰撞能量转移过程.在温度为337-357 K,利用单模半导体激光器共振激发Cs原子至6P3/2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,这可从测量由两个Cs（6P3/2）原子碰撞而被布居的4FJ态所发射的荧光得到证实.得到三体碰撞速率系数为（1.35±0.18）×10^-27cm^6s^-1,（2.22±0.21）×10^-27cm^6s^-1.An experimental study of energy transfer collisions, Cs（6P3/2） ＋ Cs（6P3/2） ＋ He→Cs（4FJ） ＋ Cs （6S1/2） ＋ He, in the range 337 K to 357 K, has 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 4FJ states populated by three-body collision. The three-body collision rate coefficients （in units of 10^-27 cm^6s^-1） for 4F5/2 and 4F7/2 are 1.35 ± 0.18,2.22 ± 0.21, 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]