State-Resolved Photodissociation Dynamics: Probing Nonadiabatic Processes in Polyatomic Free Radicals

在这个由化学系化学结构、动力学和机制（CSDM）项目资助的项目中，加州大学滨江分校的张劲松教授研究了多原子自由基的光驱动解离（光解离动力学）。自由基在许多反应性环境中是重要的，如燃烧和大气化学，它仍然是具有挑战性的，以了解他们的光化学，激发态动力学，和非绝热相互作用。该项目的目标是提供有关基准多原子自由基的光谱学、结构、能量学、光化学反应性和非绝热动力学（特别是通过锥形交叉）的详细信息。高分辨率高n里德堡原子飞行时间光谱法将被用作研究燃烧和大气化学中重要的活性中间体的光谱学和状态分辨光解动力学的主要工具。所考察的体系包括甲酰基自由基、小双自由基和烷基自由基。这些实验研究也可以为高级量子力学理论提供严格的检验。张教授将与C教授密切合作。布雷齐尔和他在长滩的加州州立大学的学生们，以加强这个西班牙裔服务学院的研究和教育活动。通过这个项目，张教授和Brazier指导研究生成为社区大学教师，与现任和未来的导师合作，并与滨江和当地社区大学的高度多样化的学生群体分享他们的知识，这些社区大学为大量少数民族学生提供服务，他们将在夏季参加研究。

In this project, funded by the Chemical Structure, Dynamics and Mechanisms (CSDM) Program of the Chemistry Division, Professor Jingsong Zhang of the University of California at Riverside investigates the light-driven dissociation of polyatomic free radicals (photodissociation dynamics). Free radicals are important in many reactive environments such as combustion and atmospheric chemistry, and it is still challenging to understand their photochemistry, excited state dynamics, and nonadiabatic interactions. The goal of this project is to provide detailed information on the spectroscopy, structures, energetics, photochemical reactivity, and nonadiabatic dynamics (especially via conical intersections) of the benchmark polyatomic radicals with quantum accuracy. High resolution high-n Rydberg atom time-of-flight spectrometry will be utilized as the main tool to study the spectroscopy and state-resolved photodissociation dynamics of reactive intermediates important in combustion and atmospheric chemistry. The systems to be examined include formyl radical, small diradicals, and alkyl radicals. These experimental studies can also provide stringent tests for high-level quantum mechanical theories. Professor Zhang will work closely with Professor C. Brazier and his students at California State University at Long Beach to enhance the research and educational activities at this Hispanic Serving Institute. Through this project, Professors Zhang and Brazier mentor graduate students to become community college teachers, collaborate with the current and future instructors, and share their knowledge with a highly diversified student population at Riverside and local community colleges that serve a large population of minority students will participate in the research during summer.