Development of a Laser Photofragmentation-Laser Induced Fluorescence Technique for the Study of Hydroperoxyl Radical Kinetics

本研究计划为期两年，涉及开发一种新的光碎裂-激光诱导荧光技术，用于研究大气条件下羟基（HO2）自由基动力学。它建立在一个证明的能力，以检测羟基（HO）自由基高灵敏度在实验室动力学研究。单脉冲激光系统将用于光解HO2，产生OH光碎片，然后由激光诱导荧光检测。激光闪光光解将用于生成HO2。最初的工作将集中在确定最佳的HO检测方案，以最大限度地提高灵敏度和最小的干扰。四种可能的HO2生成方案将用于研究氢过氧自由基与一氧化氮反应的动力学。

This research program is two years in duration and involves the development of a novel photofragmentation-laser induced fluorescence technique for the study of hydroperoxyl (HO2) radical kinetics under atmospheric conditions. It builds on a demonstrated capability to detect hydroxyl (HO) radicals with high sensitivity in laboratory kinetic studies. A single pulsed laser system will be used to photodissociate HO2, generating OH photofragments which will then be detected by laser induced fluorescence. Laser flash photolysis will be used to generate HO2. Initial work will focus on determining the optimal HO detection scheme to maximize sensitivity and minimis interferences. Four potential HO2 production schemes will be used to study the kinetics of the reaction of the hydroperoxyl radical with nitric oxide.