Laboratory Studies of the Kinetics and Photochemistry of Hydrogen Oxides (HOx) Cycling in the Lower Atmosphere

低层大气中氧化氢 (HOx) 循环动力学和光化学的实验室研究

• 批准号: 0608612
• 负责人: Anthony Hynes
• 金额: --
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-15 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0608612&HistoricalAwards=false
• 关键词: Laboratory; Studies; Kinetics; Photochemistry; Hydrogen

This work is focused on areas of current uncertainty in the chemical cycling of OH and HO2 (HOx) radicals in the troposphere. The project combines laser-based diagnostic techniques with novel experimental approaches to study the kinetics and photochemistry of several elementary processes that contribute to the production, loss, and cycling of Hydrogen oxides (HOx). These processes will be isolated and studied under realistic atmospheric conditions to the fullest extent possible. The specific areas of investigation are: 1) Kinetics and photochemistry of formaldehyde and acetone. 2) The detailed mechanism of the recombination of hydroxyl radical (OH) with nitrogen dioxide (NO2) under atmospheric conditions, including the use of a photofragment laser-induced fluorescence (LIF) scheme to directly monitor peroxynitrous acid (HOONO), together with conventional LIF detection of OH. 3) The quantum yield of oxygen atom (O1D) production from the photolysis of ozone between 290 and 411 nm. 4) Kinetics and mechanisms of the reaction of OH with propene and isoprene, including measurement of the formaldehyde yield for these reactions.The broader scientific impacts of the research include progress in understanding of the oxidizing capacity of the atmosphere, with important implications in areas such as climate and urban pollution. In addition, students at the postdoctoral, graduate, and high school level will have opportunities to learn through research about experimental atmospheric chemistry.

这项工作的重点是当前对流层中 OH 和 HO2 (HOx) 自由基化学循环的不确定性领域。 该项目将基于激光的诊断技术与新颖的实验方法相结合，研究有助于氧化氢 (HOx) 产生、损失和循环的几种基本过程的动力学和光化学。 这些过程将在尽可能真实的大气条件下被隔离和研究。 具体研究领域为：1）甲醛和丙酮的动力学和光化学。 2）大气条件下羟基自由基（OH）与二氧化氮（NO2）复合的详细机制，包括使用光碎片激光诱导荧光（LIF）方案直接监测过亚硝酸（HOONO），以及常规方法LIF 检测 OH。 3) 290 至 411 nm 之间臭氧光解产生氧原子 (O1D) 的量子产率。 4) OH与丙烯和异戊二烯反应的动力学和机制，包括这些反应的甲醛产率的测量。该研究更广泛的科学影响包括在了解大气氧化能力方面取得的进展，在以下领域具有重要意义：如气候和城市污染。 此外，博士后、研究生和高中水平的学生将有机会通过实验大气化学的研究来学习。