Molecular Beam Studies of Small Free Radicals: State-Resolved Photodissociation and Reaction Dynamics

在这个由化学系实验物理化学项目支持的项目中，张劲松将从事分子束对原型自由基的研究。 该研究计划将在三个主要领域发展：（1）小自由基如C2 H3、OH和其它小烷基和烷氧基自由基的光化学，（2）涉及系统如OH + CO和H + O2的基准自由基反应，和（3）涉及原子氢和碰撞伙伴O2、CO2的小模型系统中的能量转移/状态分辨非弹性散射，氢原子产物或散射探针的速度分布将通过高分辨率高n Rydberg原子飞行时间（HRTOF）技术获得。 获得的详细的状态分辨产物能量和角分布有望为这些自由基的光解和反应动力学提供新的见解，这些基准反过来将为高级理论提供严格的测试。 自由基是具有一个或多个未配对电子的短寿命、高反应性物质。 它们在许多化学中起着主导作用。 气相自由基是当前研究的热点，对于理解大气反应和化学燃烧现象具有重要的实际意义。

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Jingsong Zhang will pursue molecular beam studies of prototypical free radicals. This research program will be developed in three main areas: (1) photochemistry of small radicals such as C2H3, OH, and other small alkyl and alkoxy radicals, (2) benchmark radical reactions involving systems such as OH + CO and H + O2, and (3) energy transfer/state-resolved inelastic scattering in small model systems involving atomic hydrogen and colliding partners O2, CO2, and CO. Velocity distributions of the hydrogen atom products or scattering probes will be obtained via the high resolution high-n Rydberg atom time-of-flight (HRTOF) technique. The detailed state-resolved product energy and angular distributions obtained are expected to provide new insights into the photodissociation and reaction dynamics of these free radicals, and these benchmarks will in turn offer stringent tests for high-level theories. Free radicals are short-lived, highly reactive species that have one or more unpaired electrons. They play dominant roles in much of chemistry. The gas phase free radicals chosen for study in this project are of current interest and of practical importance for understanding atmospheric reactions and chemical combustion phenomena.