Elucidating the Heterogeneous Chemistry of Nitrogen Containing Species Involving Aqueous Droplets, Ice Crystals and Gas-to-Particle Conversion

越来越多的证据表明，涉及云滴，冰粒和气溶胶的非均匀过程在全球对流层化学中起着重要作用。 作为对解开所涉及的许多复杂现象的贡献，PI建议对与大气重要性含氮物种的化学有关的广泛反应进行调查。 分子过程的细节将通过三个主要活动进行研究。 第一个将涉及对解开与对流层中的氮氧化物、硝酸和亚硝酰硫酸以及氨有关的复杂化学的贡献。 第二阶段的工作将包括热化学测量，这将提供有关反应能量学的信息，特别是有关络合物的稳定性的信息，这些络合物可能在含氮物质的冷凝及其气体-颗粒转化中很重要。 研究的第三个领域将包括水相簇和冰状晶体的结构，生长和成核的调查。 这项工作的总体目标是提供补充数据，这些数据将有助于阐明分子水平上的一些物理和化学现象，通过对反应的研究，这些反应在模拟计算、大气测量和其他实验室研究的基础上被认为特别重要。 该方法是研究集群的不断增加的程度的水化，起到桥梁的制度，从小集群域的宏观粒子状态。 我们实验室的最新进展使我们能够研究整个粒径范围内的变化。

There is increasing evidence that heterogeneous processes involving cloud droplets, ice particles, and aerosols play an important role in global tropspheric chemistry. As a contribution to unraveling the many complex phenomena involved, the PI proposes to undertake investigations of a wide range of reactions pertaining to the chemistry of nitrogen containing species of atmospheric importance. The details of the molecular processes will be investigated through three major activities. The first will involve contribution to unraveling the complex chemistry associated with oxides of nitrogen, nitric acid and nitrosyl sulfuric acid, and ammonia in the troposphere. The second phase of the work will encompass thermochemical measurements which will provide information on the energetics of the reactions, and particularly on the stability of complexes which are likely to be important in the condensation of nitrogen containing species and in their gas-to-particle conversion. The third area of study will comprise investigations of the structure, growth and nucleation of aqueous phase clusters and ice-like crystals. The overall aim of the work is to provide complementary data which will serve to elucidate a number of the physical and chemical phenomena at the molecular level, through an investigation of reactions which have been proposed to be of particular importance on the basis of modeling calculations, atmospheric measurements, and other laboratory studies. The approach is to study clusters of ever increasing degrees of hydration that serve to bridge the regime from the small cluster domain to the macroscopic particle state. Recent advances in out laboratory enable us to investigate transformations over this entire range of particle size.