RUI: Heterogeneous and Photochemical Reactivity of Surface Adsorbed Organics with Atmospheric Oxidants

表面吸附的有机物影响大气气溶胶的异质和光化学反应能力，从而影响对流层的光化学循环并改变气溶胶的性质。由于对流层表面吸附有机物组成的多样性，我们对这一化学过程的了解还很不完整。本项目描述了凝聚相红外光谱研究，旨在通过同位素实验鉴定凝聚相产物，量化反应动力学，并阐明反应机理。感兴趣的具体系统包括：木质素热解产物、硝基酚和官能化多环芳香化合物，包括腐植酸和黄腐酸，在黑暗和光照条件下暴露在二氧化氮或臭氧中；以及这些有机物吸附在对流层气溶胶替代物上的异质反应能力的比较。广泛的影响包括(1)支持德鲁大学的第一个积极的物理/大气化学研究计划，该大学是一所小型文理学院。(2)在项目为期三年的时间内提供9个本科生暑期研究职位。在首席研究员的指导下，德鲁大学的本科生将在该项目的所有方面发挥不可或缺的作用，包括实验设计、数据获取和分析，以及作为与本科生合著者的期刊论文和专业会议上的陈述向科学界交流结果。(3)为当地一名高中教师提供三个暑期的研究机会。将优先考虑来自学生比例较高的学区的教师，这些学生来自科学方面代表性较低的群体。大气科学课程教材将由教师和首席研究员共同开发和共同实施。(4)支持扩展环境和大气化学课程，将研究和教学结合起来，以加强德鲁大学的化学专业，并支持开设环境研究和可持续发展的新专业。支持将有助于这个新专业的势头，以吸引和支持对环境科学感兴趣的本科生。

Surface adsorbed organics affect the heterogeneous and photochemical reactivity of atmospheric aerosols, thereby impacting tropospheric photochemical cycles and altering aerosol properties. Due to the diverse composition of surface adsorbed organics in the troposphere, our understanding of this chemistry is far from complete. This project describes condensed-phase infrared spectroscopic studies aimed at identifying condensed-phase products, quantifying reaction kinetics, and elucidating reaction mechanisms by means of isotopic experiments. Specific systems of interest include: lignin pyrolysis products, nitrophenols, and functionalized polycyclic aromatic compounds, including humic and fulvic acids, exposed to nitrogen dioxide or ozone under dark and light conditions; and a comparison of the heterogeneous reactivity of these organics adsorbed on tropospheric aerosol surrogates.Broader impacts include (1) Supporting the first active research program in physical/atmospheric chemistry at Drew University, a small liberal arts college. (2) Providing nine undergraduate summer research positions over the three-year duration of the project. Under the guidance of the principal investigator, undergraduate students at Drew will play an integral role in all aspects of the project, including experimental design, data acquisition and analysis, and communication of results to the scientific community as journal articles with undergraduate co-authors and as presentations at professional meetings. (3) Providing one local high school teacher a research opportunity for three summers. Preference will be given to a teacher from a district with a high percentage of students from groups underrepresented in science. Atmospheric science curricular material will be co-developed and co-implemented by the teacher and principal investigator. (4) Supporting curricular expansions in environmental and atmospheric chemistry by integrating research and teaching to enhance the Drew University chemistry major and by supporting a new major in environmental studies and sustainability. Support will contribute to the momentum of this new major to attract and support undergraduate students interested in environmental sciences.