Rates, Products and Hygroscopicity of Hydroxyl Radical (OH)-Initiated Oxidation Reactions of Organic Aerosols and Films

该项目涉及旨在更好地了解对流层气溶胶中有机物质命运的调查。这将通过精心设计的实验室研究来实现，这些研究考察了羟基自由基(OH)反应引发的过程，这些反应可能会转化缩合相有机化合物。实验将量化羟基与各种尺寸的有机薄膜和有机气溶胶的反应动力学。还将测定一氧化氮(NO)与氧化表面反应的动力学。这些化学反应在气相和凝聚相中的产物将被识别出来。最后，将测量氧化表面的吸水率。气溶胶化学电离质谱仪(气溶胶CIMS)和双石英晶体微天平(Dual-QCM)将是这些研究中使用的分析技术。这项研究将提供可纳入对流层化学模型的多相化学反应的新信息。这将改善这些过程的代表性，并使更好地评估人类对地球系统的影响。研究生和本科生将在这项研究中接受培训，既通过直接参与，也通过调查人员将活动纳入课程工作。

This project involves investigations designed to better understand the fate of organic material present in tropospheric aerosols. This will be accomplished through carefully designed laboratory studies that examine the processes initiated by hydroxyl radical (OH) reactions which could transform condensed phase organic compounds. Experiments will quantify the kinetics of the OH reactions with organic films and organic aerosols of a range of sizes. The kinetics of the reaction of nitric oxide (NO) with the oxidized surfaces will also be determined. The products of these chemical reactions in the gas and condensed phases will be identified. Finally, the uptake of water by the oxidized surfaces will be measured. Aerosol Chemical Ionization Mass Spectrometry (Aerosol CIMS) and Dual Quartz Crystal Microbalances (Dual-QCM) will be the analytical techniques employed in these studies.This research will provide new information on multiphase chemical reactivity that can be incorporated into models of the chemistry of troposphere. This will improve the representation of these processes, and allow better assessment of human impact on the earth system. Graduate and undergraduate students will be trained in this research, both through direct involvement and through activities incorporated into coursework by the investigator.