K-Cs混合蒸气中K(4P)+Cs(5D)碰撞能量合并  

Energy Pooling Collisions for K( 4P )+Cs( 5D ) in a K-Cs Mixture

作　　者：普拉提.艾合买提 戴康[1] 陆新红[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》2005年第4期491-493,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金 (1 0 2 640 0 4 )资助项目

摘　　要：测量了K- Cs混合蒸气中碰撞能量合并过程K(4P) +Cs(5D)→Cs(6S) +K(4D ,6S)速率系数,测量是相对于已知速率系数的过程[即Cs(6P) +Cs(5D)→Cs(6S) +Cs(7DJ) ]进行的。利用激光光解K2 和Cs2分子,得到Cs(6P ,5D)和K(4P)态原子,探测直接由光解离产生的原子发射的与由碰撞转移而布居的原子激发态发射的荧光的相对强度,结合Cs(6P)和K(4P)态的有效寿命,得到异核碰撞能量合并速率系数分别为2. 6×10 -9和3 .6×10 -9cm3 ·s-1。讨论了其他过程对速率系数的影响。The rate coefficients for energy-pooling collisions K(4P) + Cs(5D)→ Cs(6S) + K(4D, 6S) in the K-Cs vapor mixture were measured relative to a known energy-pooling rate coefficient of a homonuclear reaction [i. e., Cs(6P) + Cs(5D)→ Cs(6S) + Cs (7D(1)) ]. Populations of the Cs(6P, 5D) and K(4P) states were produced by photodissociation of K-2 and Cs-2 molecules through the use of a dye laser radiation. The resulting fluorescence included the direct components emitted in the decay of the excited states produced by photodissociation and the induced components arising from the collisionally populated states. By combining relative intensities of the components with the effective lifetimes of Cs(6P) and K(4P) states, the rate coefficients (in units of 10(-9) cm(3)• s(-1)) for the heteronuclear energy-pooling were found to be 2.6 and 3.6, respectively. The contribution to the rate coefficients from other processes are discussed.

关 键 词：能量合并 蒸气 混合 速率系数 原子激发态 s2分子 激光光解 相对强度 碰撞转移 原子发射 有效寿命 光解离 核碰撞 测量 荧光 布居 

分 类 号：O562.5[理学—原子与分子物理] X928.7[理学—物理]