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

该项目将开发一种新的化学电离质谱仪(CIMS)，适用于研究过氧自由基反应。过氧基是环境大气中重要的氧化剂，也是难以测量的物种。最初，将在国家大气研究中心使用现有的CIMS仪器进行一些实验，以确定潜在的改进。然后，将在迈阿密大学建造一台新的仪器，并使用新的光谱仪对代表周围大气气溶胶的表面上的过氧基吸收进行实验室研究。这项研究的结果将提高对气溶胶上氧化重要的过氧基的气相-表面非均相相互作用动力学的认识。这项研究的更广泛的影响包括：对目前对大气中过氧基反应的理解有了实质性的补充；在迈阿密大学建立了一个最先进的仪器，在一名新的女教员的指导下加强了能力；并通过指导参与该项目的博士后学者和学生来促进新一代年轻科学家的学术、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.