Rb(5P_J)与Ne、N_2碰撞诱导激发能量转移

Excitation energy transfer of the Rb 5P_J states induced by collisions with Ne atoms and N_2 molecules

在气体样品池条件下,研究了Rb(5PJ)+(Ne、N2)碰撞能量转移过程。用调频半导体激光器激发Rb原子至Rb(5P3/2)态,在不同的Ne或N2气压下,测量了直接5P3/2→5S1/2荧光和转移5P1/2→5S1/2荧光。对于5PJ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,5P3/2→5S1/2转移速率系数为1.53×10-12cm3s-1。对于N2,测量5PJ+Ne和5PJ+N2二种情况下荧光的相对强度比,利用最小二乘法确定5P3/2→5S1/2转移速率系数为1.05×10-10cm3s-1,5PJ态猝灭速率系数为1.12×10-10cm3s-1。与其他实验结果进行了比较。

The collisional energy transfer process Rb （SPJ） ＋ M, where M= Ne,N2 under gas cell conditions has been investigated. The Rb （5P3/2） state was excited by a diode laser. The direct 5P3/2→5S1/2 fluorescence and the sensitized 5P1/2→5S1/2 fluorescence as a function of quenching gas pressure had been measured. For collision with Ne where only electronic to translational energy tinnier is possible. However, in the N2 case, electronics to vibrational or rotational transfer is important. Using a two- state rate equation model the transfer rate coefficients from Rb（SPJ） had been obtained. The rate coefficient for 5P3/2→SP1/2 transfer in collision with Ne is 1.53×10^-12cm^3s^-1. By comparing the relative fluorescence intensities for Ne and N2 case, and fitting the experimental results to the rate equation analysis, we estimate that the rate coefficient for 5P3/2→SP1/2 tinnier in collision with N2 is 1.05×10^-10cm^3s^-1. The quenching rate coefficient out of the 5PJ state is 1.12×10^-10cm^3s^-1 .The results are discussed in relation to those of other experiments.