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

这个更新奖的重点是继续使用敏感光谱技术来确定气相醛的波长依赖光解量子产率，这是大气化学家关注空气质量和大气氧化能力的兴趣所在。了解这类有机大气成分的甲酰（HCO）自由基的量子产率对于模拟对流层中发现的关键氧自由基家族HOx的生成至关重要。除了将定量实验室研究扩展到考虑更多和更高分子量的醛（甘油醛和乙醇醛）之外，还将对乙炔的氧化和2-硝基苯甲醛的光解进行进一步研究。最后一个研究领域涉及硝酸（HNO3）吸附在确定（铝）和自然（冰）表面的光解作用，以及其在UV （290-310nm）区域的吸收截面的测定。大气化学反应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，这是一项重要的社会需求。这项研究也将有助于培养和教育女学生和女博士后。

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.