Rb-Ne光学碰撞能量转移  

Energy Transfer in the Optical Collision of Rb-Ne

作　　者：孙茂珠[1] 戴康[2] 沈异凡[2] 

机构地区：[1]石河子大学师范学院,新疆石河子832003 [2]新疆大学物理科学与技术学院,新疆乌鲁木齐830046

出　　处：《石河子大学学报（自然科学版）》2007年第4期521-524,共4页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(10264004)

摘　　要：在气体样品池条件下,研究了Rb(5Pj)+Ne碰撞能量转移过程。将调频半导体激光器的波长稍微调离共振线,用激光激发光学薄的Rb蒸汽和低密度Ne的混合系统,激发态RbNe(E)通过解离或碰撞转移产生出Rb5P态。在不同的Ne气压下,测量直接荧光5P1/2→5S1/2和5P3/2→5S1/2转移荧光,由谱线的峰值强度比给出Rb5Pj态布居的相对大小,利用速率方程和最小二乘法得到碰撞转移截面和碰撞转移速率系数。实验结果表明,Rb5Pj精细结构碰撞转移截面是8.33×10-18cm2(当压强P>133Pa)和5.94×10-17cm2(当压强P<133Pa),相应的转移速率系数是5.53×10-13cm3/s和3.94×10-12cm3/s。最后分析了转移截面随压强变化的原因。The collisional energy transfer process Rb（5Pj） ＋ Ne has been investigated under gas cell conditions. An optically thin gaseous mixture of Rb and low-density Ne was excited by a FM diode laser, whose wavelength was put slightly out of the resonance line. The excited RbNe（E） produced Rb5P states through dissociation or collisional energy transfer. The direct fluorescence and the sensitized fluorescence have been measured in various pressure of Ne. The relative population of Rb5Pj state was worked out by the ratio of the intensity of fluorescence. The collisional transfer cross sections and the transfer rate coefficients were obtained by using a two-state rate equation model and least squares fitting. The experimental results indicated that the fine structure transfer cross sections of Rb5Pj were 8.33×10^-18cm^2（when pressure P 〉 133Pa）and 5.94 ×10^- 17cm^2（when pressure P 〈 133Pa）. Corresponding transfer rate coefficients were 5.53 ×10^-12cm^3 s^-1 and 3.94 ×10^-12 cm^3s^-1 . The reason why the cross section changed with pressure, was analyzed.

关 键 词：铷 碰撞能量转移 荧光 碰撞截面 

分 类 号：O562.5[理学—原子与分子物理]