The Dynamics of Chemical Reactions Involving Free Radicals and Excited Species

在化学部实验物理化学计划的这一项目中，保罗·达格迪吉安将研究分子束中原子和小分子自由基的气相动力学。激光诱导荧光将被用来确定内部产物态分布。我们将研究原子-自由基反应和自由基-自由基反应。在他的研究计划的一个新方向，达格迪吉安将使用受激拉曼激发来检测氧和氯原子与振动激发的甲烷同位素异构体的反应，以制备分子试剂。用发射和激光诱导荧光检测方法研究了激发态Al原子与H2的反应。在这个项目中，达格迪吉安将研究用一种特定类型的激发来激励其中一个反应伙伴对化学反应速率或路径的影响。激发强度较大的原子将与某些分子反应，或者激发强度较小的其他较大分子将与原子反应。这样的研究将有助于理解在反应的原子和分子中激发这些不同的模式对反应的影响。这些都是非常基础的研究，可能会影响半导体或材料制造等实际领域。

In this project in the Experimental Physical Chemistry Program of the Chemistry Division, Paul Dagdigian will study the gas-phase dynamics of atoms and small molecular free radicals in molecular beams. Laser-induced fluorescence will be used to determine the internal product state distributions. Both atom-radical and radical-radical reactions will be studied. In a new direction for his research program, Dagdigian will examine the reaction of oxygen and chlorine atoms with vibrationally excited methane isotopomers using stimulated Raman excitation to prepare the molecular reagents. The reactions of excited Al atoms with H2 will be investigated using emission and laser-induced fluorescence detection. In this project Dagdigian will study the effect on the rate or pathway of a chemical reaction of energizing one of the reacting partners with a specific type of excitation. Atoms with a large amount of excitation will be reacted with certain molecules, or other larger molecules with lesser amounts of excitation will be reacted with atoms. Such studies will permit an understanding of the effect on reactions of exciting these different modes in the reacting atoms and molecules. These are very fundamental studies which could impact practical areas such as semiconductor or materials manufacturing.