Cs(6P)+(Ne,N_2)碰撞能量转移  

Energy Transfer in Cs(6P)+(Ne,N_2) Collisions

作　　者：王淑英[1] 孙茂珠[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：《光谱学与光谱分析》2007年第6期1044-1046,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(10264004)资助

摘　　要：在气体样品池条件下,研究了Cs(6P3/2)+(Ne,N2)碰撞能量转移过程。用调频半导体激光器激发Cs原子至Cs(6P3/2)态,在不同的Ne或N2气压下,测量了直接6P3/2→6S1/2荧光和转移6P1/2→6S1/2荧光,对于6P3/2与Ne的碰撞,电子态能量仅能转移为Ne原子的平动能。在与N2的碰撞中,向分子振转态的转移是重要的。利用速率方程分析,可以得到碰撞转移速率系数,对于Ne,6PJ精细结构碰撞转移速率系数为1·45×10-12cm3·s-1。对于N2,测量6P+Ne和6P+N2二种情况下荧光的相对强度比,确定精细结构速率系数为1·64×10-12cm3·s-1,6P态猝灭速率系数为4·88×10-12cm3·s-1。The collisional energy transfer process Cs（6P（3/2））＋M, where M=Ne, N2, under gas cell conditions has been investigated. The Cs（6P（3/2） ） state was excited by a diode laser. The direct 6P（3/2）→6S（1/2） fluorescence and the sensitized 6P（1/2）→6S（1/2） fluorescence as a function of quenching gas pressure were measured. For quenching by Ne only energy transfer from the electronic to translational is possible. However, in the N2 case, energy transfer from the electronic to vibrational or rotational is important. Using a two-state rate equation model, the quenching rate coefficients for Cs（6P（3/2） ） were obtained. The fine structure energy transfer rate coefficient for Ne is 1.45×10^-12 cm^3·s^-1. By comparing the relative fluorescence intensities for Ne and Nz case, the authors estimate that the rate coefficient for 6P（3/2）→6P（1/2） transfer in collision with N2 is 1.64 × 10^-12 cm^3· s^-1. The quenching rate coefficient for the 6P state is 4.88×10^-12 cm^3·s^-1.

关 键 词：能量转移 荧光 速率系数 CS NE N2 

分 类 号：O562.5[理学—原子与分子物理]