State-Resolved Photodissociation Dynamics of Polyatomic Free Radicals

在这个由化学系实验物理化学计划资助的项目中，加州大学滨江分校的张劲松教授将研究分子束中典型的多原子自由基的光化学。高分辨率高n里德堡原子飞行时间光谱法（HRTOF）将被用来研究光谱学和状态分辨的光解离动力学的反应性中间体在燃烧和大气化学中的重要性。所研究的体系包括乙烯基自由基、亚乙烯基自由基、甲酰基自由基和HOCO自由基，所要研究的科学问题包括：（a）开壳层电子态和势能面，以及它们之间的非绝热相互作用和对光解动力学的影响，（B）涉及自由基的复杂核重排和竞争解离途径的详细机制，（c）自由基的非绝热相互作用，（d）自由基的非绝热相互作用，（e）自由以及（c）自由基电子结构、热力学和能量学。该研究还将为理论化学和物理学社区提供高质量的基准。加州大学滨江分校的研究生和本科生将参与这项研究。他们将通过多学科研究活动获得知识和技能。来自加州州立大学和当地社区学院的教职员工和本科生将在夏季参加这项研究。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Professor Jingsong Zhang of the University of California at Riverside will investigate the photochemistry of prototypical polyatomic free radicals in molecular beams. High resolution high-n Rydberg atom time-of-flight spectrometry (HRTOF) will be utilized to study spectroscopy and state-resolved photodissociation dynamics of reactive intermediates important in combustion and atmospheric chemistry. The systems to be studied include vinyl radical and vinylidene, formyl radical, and HOCO radical.The scientific issues to be examined include: (a) open-shell electronic states and potential energy surfaces, and their nonadiabatic interactions and influences on photodissociation dynamics; (b) detailed mechanisms involving complex nuclear rearrangements and competitive dissociation pathways of free radicals; and (c) free radical electronic structures, thermodynamics, and energetics. The research will also provide high-quality benchmarks for the theoretical chemistry and physics communities.A diversified group of graduate and undergraduate students at the University of California at Riverside will participate in this research. They will acquire knowledge and skills through the multi-disciplinary research activities. Faculty members and undergraduate students from California State University and local community colleges will participate in the research during the summer.