Molecular Beam Studies of State-Resolved Photodissociation Dynamics of 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自由基的性质。激光光谱学以及时间分辨和状态到状态的光解离动力学将被应用于与燃烧、大气化学、化学气相沉积以及有机和聚合物化学相关的典型反应中间体。要研究的体系包括双原子氢化物、小分子烷基和不饱和脂肪族自由基。将特别关注：a)涉及解离和复杂核重排的详细机制；b)开壳电子态、结构和多个势能面及其对光解/单分子反应的影响；c)竞争解离途径和分解机制，以及产物能量处理；以及d)自由基电子态、热力学和能量学。这项研究的目的是在与闭壳分子相同的水平上实现对自由基光化学的理解。研究生和本科生将参与这项研究。他们将获得知识和技能，为进修或在工业、学术界或政府实验室就业做准备。

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 properties of free radicals in molecular beams. Laser spectroscopy, as well as time-resolved and state-to-state photodissociation dynamics will be applied to prototypical reactive intermediates of relevance to combustion, atmospheric chemistry, chemical vapor deposition, and to organic and polymer chemistry. The systems to be studied include diatomic hydride-, small alkyl-, and unsaturated aliphatic radicals. Specific attention will be given to: a) detailed mechanisms involving dissociation and complex nuclear rearrangements; b) open-shell electronic states, structures and multiple potential energy surfaces and their influences on photodissociation/unimolecular reactions; c) competitive dissociation pathways and decomposition mechanisms, and product energy disposal; and d) free-radical electronic states, thermodynamics, and energetics. This research aims to achieve an understanding of free-radical photochemistry at the same level as that for closed-shell molecules. Graduate and undergraduate students will participate in this research. They will acquire knowledge and skills in preparation for advanced studies or employment in industry, academia, or government laboratories.