Solvated Salts and Acids: Contributions to Basic Understanding of Nucleation, Particle Growth, and Aerosol Chemistry

这项工作将继续对水流星系统的团簇化学及其揭示的气体到粒子转化过程的行为以及大气气溶胶粒子的性质进行创新研究。团簇是原子或分子的小气相聚集体，其组成和大小特征可以在实验室环境中控制，从而允许研究它们的反应性和生长。因此，适用于大气化学的体系中的非均相过程，如成核、溶剂化和表面吸附，都可以进行详细的机理研究。拟研究的系统包括：水团簇离子和酸的溶解和成核过程。酸和简单盐(例如，HX，其中X是卤素；硝酸)中的溶剂化现象，包括卤素置换，这是一个已知的大气过程。卤酸和其他酸体系中双自由基离子的存在和离子对的形成。这些研究的一个更广泛的影响是物理化学和大气化学学科之间正在进行的对话，包括跨学科的概念和技术意识以及学生培训。

This work will continue innovative investigations into cluster chemistry of hydrometeor systems and what they reveal as to the behavior of gas-to-particle conversion processes, and the nature of atmospheric aerosol particles. Clusters are small gas-phase aggregates of atoms or molecules whose composition and size characteristics can be controlled in a laboratory setting, allowing their reactivity and growth to be studied. Heterogeneous processes in systems applicable to atmospheric chemistry such as nucleation, solvation and surface adsorption are thus amenable to detailed mechanistic investigation. Systems to be studied include: . Dissolution and nucleation processes of water cluster ions and acids . Solvation phenomena in acids and simple salts (e.g., HX where X is a halogen; nitric acid) including halogen replacement, a known atmospheric process . Existence of biradical ions and ion-pair formation in haloacids and other acid systems . Nucleation of organic species (e.g., acetone, pyridine, simple carboxylic acids, halogenated organics and polycyclic aromatic hydrocarbons in water clusters).A broader impact of these investigations is the ongoing dialog between the disciplines of physical chemistry and atmospheric chemistry, including interdisciplinary concept and technique awareness and student training.