Stereo-Dynamical Processes of Chemical Reactions Observed by Orienting Molecules

1)利用H_2O脉冲辉光直流放电产生了OH(^2P)自由基，采用1-m长的静电六极选态和激光诱导荧光技术相结合的方法，测量了OH(^2P)自由基的单量子态|JWM_J&gt；=|1/2 1/2&gt；的聚焦曲线，并利用激光诱导荧光技术对OH(A←X)在308 nm~2处的跃迁进行了无损尺寸选择。研究了DCl二聚体的光解过程，其中DCl二聚体在光解前使用相同的六极静电场从DCL簇束中优先选择。我们观察到了由于氢原子从(DCI)_(23)中消除而产生的[ClDCl]瞬变物种的内部能量分布。为了阐明表面反应的立体动力学，我们建造了一台具有六个lm棒的超高真空兼容定向分子束机。我们用氯化甲烷试剂气体对这台机器进行了表征，以确保如期进行表面实验，并确认了所选束流的取向密度为单一|jkm&gt；=|111&gt；状态的86%。4)在反应动力学分析的基础上，提出了氢分子在Ir单晶表面解离-吸附过程中热原子的新机制

1) The OH(^2P) radicals were produced by a pulsed glow DC discharge of H_2O.The focusing curve for the single quantum state |JWM_J> = |1/2 1/2 1/2 > of OH(^2P) radicals was measured using the combined method of an electrostatic hexapole state-selection with 1-m in length and a laser induced fluorescence technique for the OH(A ← X) transition at 308 nm2) Non-destructive size selection of neutral clusters was carved out using the hexapole electric field. The photodissociation of DCI dimer was studied, in which DCl dimer was preferentially selected from the DCl cluster beam using the same hexapole electrostatic field prior to the photolysis. We were able to observe the internal energy distribution of the [ClDCl] transient species resulting from the hydrogen atom elimination from (DCI)_23) We constructed a UHV compatible oriented-molecular-beam machine with six lm rods in order to elucidate the stereodynamics in surface reactions. We characterized this machine using a reagent gas of methylchloride to ensure satisfactory specification for conducting surface experiment in schedule and we confirmed that the orientational degee of the selected beam is as 86% pure as single |JKM> = |111> state4) We proposed a new hot-atom mediated mechanism in the dissociative-adsorption process of hydrogen molecule on Ir single crystal surfaces, based on the analysis of reaction kinetics