Homogeneous and Heterogeneous Photochemical Reactions Related to Atmospheric Aldehydes and Nitric Acid

与大气醛和硝酸相关的均相和非均相光化学反应

• 批准号: 0653761
• 负责人: Lei Zhu
• 金额: $ 54.84万
• 依托单位: Health Research Incorporated/New York State Department of Health
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-01 至 2012-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0653761&HistoricalAwards=false
• 关键词: Homogeneous; Heterogeneous; Photochemical; Reactions; Related

The focus of this renewal award is the continuation of the use of sensitive spectroscopic techniques to determine the wavelength dependent photodissociative quantum yields of gaseous phase aldehydes of interest to atmospheric chemists concerned with air quality and the oxidative capacity of the atmosphere. Knowing the quantum yield of the formyl (HCO) radical of this class of organic atmospheric constituents is of fundamental importance in modeling production of HOx, a key family of oxygen radicals found in the troposphere. As well as extending quantitative laboratory studies to consideration of additional and higher molecular weight aldheydes (glycidaldehyde and glycolaldehyde), further investigations on the oxidation of acetylene, and the photolysis of 2- nitrobenzaldehyde will be undertaken. A final area of investigation concerns the photolysis of nitric acid (HNO3) adsorbed on defined (aluminium) and natural (ice) surfaces, together with a determination of its absorption cross section in the UV (290-310nm) region.Quantitative studies of the gas-phase kinetics of atmospheric chemical reactions serve as the basis for the modelling of air quality in urban and in the natural environments, an important societal need. This research will also contribute to the training and education of women students and postdocs.

该更新奖项的重点是继续使用敏感的光谱技术来确定关注空气质量和大气氧化能力的大气化学家感兴趣的气相醛的波长依赖性光解离量子产率。 了解这类有机大气成分的甲酰基（HCO）自由基的量子产率对于模拟HOx的产生至关重要，HOx是对流层中发现的氧自由基的关键家族。 以及扩大定量实验室研究，以考虑额外的和更高分子量的醛（乙醛和乙醇醛），乙炔的氧化和2-硝基苯甲醛的光解将进行进一步的调查。 研究的最后一个领域涉及硝酸（HNO 3）吸附在定义的（铝）和天然（冰）表面，以及在紫外线吸收截面的测定（290- 310纳米）区域。对大气化学反应的气相动力学的定量研究是城市和自然环境中空气质量建模的基础，一个重要的社会需求。这项研究还将有助于女学生和博士后的培训和教育。