K(3D)+H_2→KH+H反应的转动分辨截面的测量  

Measurement of the Rotational Distinguish Cross Sections for the K(3D)+H_2→KH+H Reaction

作　　者：穆尼赛.努尔麦麦提 沈异凡[1] 戴康[1] 普拉提.艾合买提 

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2期197-200,共4页Journal of Xinjiang University(Natural Science Edition)

基　　金：国家自然科学基金项目(10664003)

摘　　要：利用泵浦—检测技术,研究了K(3D)与H_2反应生成的KH[X^1∑^+(v,J)]分子的转动态分布,利用激光感应荧光光谱(LIF),确定了v=0,1振动能级上的转动态分布.转动态分布与热统计分布基本一致.记录X^1∑^+(v,J)←A^1∑^+(v′,J+1)时间分辨荧光,从荧光强度的对数值给出的直线斜率得到它的自发辐射寿命.K激发态原子密度由泵浦激光通过样品池后的能量损失得到,反应生成物KH分子密度利用光学吸收法得到,由速率方程分析,得到σ(V,J),对J求和,得到σ(v)分别为(0.8±0.3)×10^(-16)cm^2[对v=0],为(0.7±0.3)×10^(-16)cm^2[对v=1].Using a pump-probe method, the reaction of K （3D） with H2 has been studied. The KH[X^1∑＋ （v, J] molecules were found in the v = 0,1 states. The nascent rotational distributions of KH（v, J） were determined from LIF spectrum. The rotational population profile was roughly consistent with a statistical distribution at the system temperature. The decay signal of time-resolved fluorescence from X^1∑＋ （v, J） ← A^1∑＋ （v^＇,J＋1） transitions was monitored. The semilog plot of the time-resolved fluorescence was shown. The slope yielded the spontaneous lifetime. The densities of K （3D） atoms excited by a pulse laser beam were evaluated directly from the laser energy loss which was absorbed by K atoms. The densities of KH molecules were measured by monitoring the absorption of a counter-propagating pulse dye laser beam, tuned to X^1∑＋ （v, J） ←A^1∑＋ （v＇, J＋ 1） transitions. Using a rate equation model, we obtain reactive cross sections a （v, J）. The cross sections are obtained by summing the individual cross sections. The cross sections （in units of 10-16cm^-2） for excitation are （0.84-0.3） for v being 0 and （0.7±0.3） for v being 1 respectively.

关 键 词：光化学反应 泵浦-检测技术 布居分布 反应截面 K—H2 

分 类 号：O561.5[理学—原子与分子物理] O644.18[理学—物理]