Water Vapor Dependence of the Reaction Kinetics of the Methylperoxyl Radical with Hydroperoxyl and Itself

甲基过氧自由基与氢过氧及其本身的反应动力学的水蒸气依赖性

• 批准号: 0631167
• 负责人: Jaron Hansen
• 金额: $ 24.95万
• 依托单位: Brigham Young University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0631167&HistoricalAwards=false
• 关键词: Water; Vapor; Dependence; Reaction; Kinetics

Experimental investigation of the kinetics of the methylperoxyl + hydoperoxyl (CH3O2 + HO2) and methylperoxyl self-reaction as a function of pressure and water vapor will be conducted. Laser Flash Photolysis/UV Time-Resolved/Near-IR Wavelength Modulated Diode Laser Spectroscopy will be utilized to measure the kinetics and products of the title reactions over a range of atmospherically relevant conditions (220-298 K, 50-760 Torr). The equilibrium constant for the formation of a CH3O2-H2O complex will be measured between 220 and 298 K and at pressures ranging between 50 and 760 Torr. Results of the water dependence on the reactions will be used to address discrepancies between modeled and measured values of HOx (OH, HO2 and H2O2) and organic peroxides in the upper troposphere. In addition, the work in this proposal will generate data about the role of water in the kinetics of atmospherically important reactions. Critical to the understanding of the atmospheric implications of hydrated CH3O2 is a measurement of its abundance in the atmosphere; data on the equilibrium constant will help to predict this abundance.This project will provide research and training opportunities for both graduate and undergraduate students. A gas phase kinetics experiment will be designed and introduced into the undergraduate physical chemistry curriculum.

将进行对甲基氧基 +羟基氧基（CH3O2 + HO2）和甲基氧基自反应作为压力和水蒸气的函数的实验研究。激光闪光光解/UV时间分辨/近IR波长调制二极管激光光谱将用于测量在一系列与大气相关的条件下（220-298 K，50-760 Torr），测量标题反应的动力学和产物。形成CH3O2-H2O复合物的平衡常数将在220至298 K之间测量，在50至760 Torr之间的压力下。水依赖性的结果将用于解决对流层上部对流层中HOX（OH，HO2和H2O2）的建模和测量值（OH，HO2和H2O2）与有机过氧化物之间的差异。此外，该提案中的工作将生成有关水在大气重要反应动力学中的作用的数据。对理解水合CH3O2的大气影响至关重要的是对大气中丰度的测量。关于平衡常数的数据将有助于预测这种丰富性。该项目将为研究生和本科生提供研究和培训机会。气相动力学实验将被设计并引入本科物理化学课程。