Investigation of Vibrational Mode Selectivity in State- Selected Bimolecular Reactions

9308430 Sinha在化学系物理化学项目中，加州大学圣地亚哥分校的A.Sinha教授将进行一项研究项目，研究分子振动对多原子分子化学反应的影响。通过激发具有相似能量的试剂分子的振动态，并观察这种初始态选择对反应速率、产物量子态分布和产物支化率的影响，来研究双分子反应中特定振动模式的影响。这将通过使用几种不同的激光激发方案来制备与小多原子分子中广泛的核运动相对应的振动态，然后通过使用激光光谱学检测反应产物来监测它们随后与各种自由基的反应。化学反应及其相关反应动力学的研究处于当代物理化学的前沿。本研究的目的是了解具有相似总能量但对应于不同分子内激发分布的各种分子振动如何影响化学反应活性。完全分辨激发态的测量结果能够与目前的理论模型进行详细的比较，并有望为化学反应中影响选择性的因素提供新的见解。***

9308430 Sinha In this project in the Physical Chemistry Program of the Chemistry Division, Prof. A. Sinha of the University of California at San Diego will conduct a research program to study the influence of molecular vibrations on the chemical reactivity of polyatomic molecules. The effect of specific vibrational modes in bimolecular reactions will be investigated by exciting vibrational states of reagent molecules having similar energy, and observing the consequences of this initial state selection on the reaction rate, the product quantum state distributions, and the product branching ratios. This will be accomplished by using several different laser excitation schemes to prepare vibrational states corresponding to a wide range of nuclear motion in small polyatomic molecules and then monitoring their subsequent reactions with various radicals by detecting the reaction products using laser spectroscopy. %%% The study of chemical reactions and their associated reaction dynamics stands at the forefront of contemporary physical chemistry. The goal of the present study is to understand how various molecular vibrations having similar total energy but corresponding to different intramolecular distribution of the excitation influence chemical reactivity. Measurements in which the excited states are fully resolved yield data which allow detailed comparisons with current theoretical models and promise to provide new insights into the factors that influence selectivity in chemical reactions. ***