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，加州大学河滨分校的张静松教授将研究分子束中原型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(HRTOF)将被用来研究在燃烧和大气化学中重要的反应中间体的光谱和状态分辨光解动力学。将被研究的体系包括：(A)开壳电子态和势能面，以及它们的非绝热相互作用和对光解动力学的影响；(B)涉及复杂的核重排和自由基竞争性解离途径的详细机理；(C)自由基电子结构、热力学和能量学。这项研究还将为理论化学和物理界提供高质量的基准。加州大学河滨分校的一群多元化的研究生和本科生将参与这项研究。他们将通过多学科的研究活动获得知识和技能。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与这项研究。

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.