Li(2P)+H_2→LiH+H反应转动分辨截面的测定  

Experimental Evaluation of Rotationally Resolved Cross-sections for the Li(2P)+H_2→LiH+H Reaction

作　　者：王雪燕[1] 王大贵[1] 周冬冬[1] 穆尼赛[1] 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：《新疆大学学报（自然科学版）》2010年第4期461-464,共4页Journal of Xinjiang University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10664003)

摘　　要：利用光学吸收技术,测定了Li(2P)+H→LiH+H的反应截面.仅在LiH基态的ν=0能级才发现有布居.通过吸收谱的测量,确定LiH(0,J)的转动态分布.由速率方程分析得到反应截面σ(J),总的反应截面为所有σ(J)之和,结果是(0.4±0.19)×10-16cm2.LiH(0,J)的分布接近统计分布,转动线吸收强度除以2J+1的对数与J(J+1)成线性关系,由斜率给出转动温度为(1529±0.05)K.观察结果给出了以下的结论:直线反应碰撞机制不适用于Li+H2系统,而插入式的反应机制适用于该系统.Rotationally resolved total cross sections of theLi（2P）＋H-LiH＋H reaction have been investigated using absorption technique. LiH was found in the v = 0 state. Absorption signals were converted to nascent LiH populations using saturation absorption .Using a rate equation model ,we obtain reaction cross sections σ（J） ,The total cross section is obtained by summing the individual cross sections σ（J）. It is （0.4±0.19）×10^-16cm^2.The rotational distributions are close to statistical ones. A plot of the logarithm of the relative absorption intensities of states divided by the degeneracy factor 2J＋ 1 against J（J＋1） was yielded. The linearity of the plot establishes the Boltzmann form for the rotational distributions. The rotational temperature is （1529 ± 0.05）K. The observation provides indirect evidence that the collinear collision geometry by the harpoon mechanism is not applicable to this system. The insertion mechanism in C2v collision geometry is favored.

关 键 词：激光化学 反应碰撞截面 吸收技术 布居分布 Li-H2 

分 类 号：O561.5[理学—原子与分子物理] O644.1[理学—物理]