Development of a New Chemical Ionization Mass Spectrometer (CIMS) for Uptake Studies of Peroxyl Radicals (RO2) by Atmospherically Relevant Surfaces

本项目将开发一种用于研究过氧自由基反应的新型化学电离质谱仪（CIMS）。过氧自由基是大气中重要的氧化剂，也是较难测定的种类。最初，一些实验将在国家大气研究中心现有的CIMS仪器上进行，以确定潜在的改进。然后，迈阿密大学将建造一个新的仪器，并使用新的光谱仪对具有代表性的大气气溶胶表面上的过氧自由基的吸收进行实验室研究。这项研究的结果将提高人们对气溶胶上氧化性重要的过氧自由基的气-表面非均相相互作用动力学的认识。该研究的广泛影响包括：对目前对大气中过氧自由基反应的理解有了实质性的补充；在一名新的女教员的指导下，在迈阿密大学建立一项最先进的永久仪器能力提高方案；并通过对参与该项目的博士后学者和学生的指导，向新一代年轻科学家推广奖学金、技术转让和研究经验。

This project will develop a new Chemical Ionization Mass Spectrometer (CIMS) instrument adapted to study peroxy radical reactions. Peroxy radicals are important oxidants in the ambient atmosphere and difficult species to measure. Initially, some experiments will be conducted with an existing CIMS instrument at the National Center for Atmospheric Research to determine potential improvements. Then a new instrument will be constructed at University of Miami and laboratory studies of the uptake of peroxy radicals on surfaces representative of ambient atmospheric aerosols conducted using the new spectrometer. Results from this study should improve knowledge on the kinetics of gas-surface heterogeneous interactions of oxidatively important peroxy radicals on aerosol. Broader impacts of the research include: a substantive addition to current understanding of reactions of peroxy radicals in the atmosphere; establishing a state of the art permanent instrument capacity enhancement at University of Miami under the direction of a new female faculty member; and through the mentoring of postdoctoral scholars and students involved on this project promoting scholarship, technology transfer, and research experience to a new generation of young scientists.