Photodissociation Dynamics of Transient Species

在这个由化学学部实验物理化学项目资助的项目中，Hanna Reisler教授和她的学生将研究弱结合和开壳系统的光解离，包括具有低电离势的分子和自由基以及氢键，酸碱二聚体。电子态之间的相互作用在这些物种中普遍存在，导致电子构型改变的潜在表面和多种途径的反应。光碎片离子成像将用于确定解离产物的成对相关分布，并更好地了解光解离的动力学和机制。母体激发态和碎片的光电子成像将表征激发态和状态之间的耦合。Reisler将与加拿大国家研究委员会的Albert Stolow合作，采用时间分辨光电子能谱和飞秒重合成像来确定耦合解离态的时间演化。电子结构计算将有助于全面了解这些体系的反应性。这些研究有望提高我们对大气化学的理解，以及与生物学相关的氢键物种的化学。这项研究将与本科生、研究生和博士后研究助理一起进行，并与南加州大学（University of Southern California）一项针对科学和工程领域女性的综合指导计划相结合。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Professor Hanna Reisler and her students will study the photodissociation of weakly bound and open shell systems, including molecules and radicals with low ionization potentials and hydrogen-bonded, acid-base dimers. Interactions among electronic states are prevalent in these species, resulting in potential surfaces with changing electronic configurations and reactions with multiple pathways. Photofragment ion imaging will be exploited to determine the pair-correlated distributions of dissociation products and to better understand the dynamics and mechanisms of photodissociation. Photoelectron imaging of parent excited states and of fragments will characterize the excited electronic states and couplings between states. Reisler will collaborate with Albert Stolow of the National Research Council, Canada to employ time-resolved photoelectron spectroscopy and femtosecond coincidence imaging to determine the time evolution of coupled dissociative states. Electronic structure calculations will aid in attaining a comprehensive understanding of reactivity in these systems. These studies promise to improve our understanding of atmospheric chemistry as well as the chemistry of hydrogen-bonded species relevant to biology. The research will be conducted with undergraduate and graduate students and postdoctoral research associates, in conjunction with a comprehensive mentoring program for women in science and engineering at the University of Southern California.