Rb(5P_J)+(Ne、N_2)碰撞能量转移  

Rb(5P_J)+(Ne, N_2) collisional energy transfer

作　　者：许瑾[1] 王青[1] 亚森江.吾甫尔 戴康[1] 沈异凡[1] 

机构地区：[1]新疆大学物理科学与技术学院,新疆乌鲁木齐830046

出　　处：《量子电子学报》2007年第4期447-450,共4页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(10264004)

摘　　要：在气体样品池条件下,研究了Rb(5P_J)+(Ne、N_2)碰撞能量转移过程。对于5P_J与Ne的碰撞,电子态能量仅能转移为Ne原子的平动能。在与N_2的碰撞中,向分子振转态的转移是重要的。调频半导体激光器稍微调离共振线,激发Rb原子至Rb(5P_(3/2))态,在不同的Ne或N_2气压下,测量了5P_(1/2)→5S_(1/2)与5P_(3/2)→5S_(1/2)荧光强度比。利用速率方程分析,可以得到碰撞转移速率系数,对于Ne,5P_(3/2)→5P_(1/2)转移速率系数为1.53×10^(-12)cm^3s^(-1)。对于N_2,由5P_J+Ne和5P_J+N_2二种情况下5P_(1/2)与5P_(3/2)荧光的相对强度比,利用最小二乘法确定5P_(3/2)→5P_(1/2)转移速率系数为8.83×10^(11)cm^3s^(-1),5P_J态猝灭速率系数为1.25×10^(-10)cm^3s^(-1)。对实验结果进行了定性的讨论。The collisional energy transfer in Rb（5PJ）＋M collisions, where M=Ne, N2 under gas cell conditions was investigated. For collision with Ne only electronic to translational energy transfer is possible. However, in the N2 case, electronics to vibrational or rotational transfer is important. The Rb（5P3/2） state is excited by a tunable CW diode laser, where the laser is tuned slightly off resonance. The ratio of 5P1/2 → 5S1/2to the 5P3/2 → 5S1/2 fluorescence as a function of quenching gas pressure was measured. Using a two-state rate equation model the transfer rate coefficients from the Rb（5PJ） state was obtained. The rate coefficient for 5P3/2 → 5P1/2 transfer in collision with Ne is 1.53 × 10^-12cm^3s^-1. Using the ratio of the 5P1/2 to 5P3/2 fluorescence for Ne and N2 case, and fitting the experimental results to the rate equation analysis, we estimate that the rate coefficient for 5P3/2 → 5P1/2 transfer in collision with N2 is 8.83 ×10^-11 cm^3s^-1. The quenching rate coefficient of the 5PJ state is 1.25 ×10^-11 cm^3s^-1. A qualitative explanation for the results was given.

关 键 词：光谱 碰撞能量转移 荧光 速率系数 RB 

分 类 号：O562.5[理学—原子与分子物理]