Photodissociation Dynamics of Transient Species

瞬态物质的光解离动力学

• 批准号: 0616298
• 负责人: Hanna Reisler
• 金额: --
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0616298&HistoricalAwards=false
• 关键词: Photodissociation; Dynamics; Transient; Species

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.

在这个由化学系实验物理化学计划资助的项目中，汉娜·赖斯勒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。在这些物种中，电子态之间的相互作用很普遍，导致势能表面的电子构型发生变化，反应的路径也不同。光碎片离子成像将被用来确定解离产物的对关联分布，并更好地了解光解离的动力学和机理。母体激发态和碎片的光电子成像将表征激发电子态和态之间的耦合。赖斯勒将与加拿大国家研究委员会的阿尔伯特·斯托洛合作，利用时间分辨光电子能谱和飞秒符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中的反应性。这些研究有望提高我们对大气化学以及与生物学相关的氢键物种化学的理解。这项研究将与本科生、研究生和博士后研究助理一起进行，同时还将与南加州大学针对女性科学和工程专业的全面指导计划相结合。