Gas Phase Ion Chemistry and Thermochemistry

在化学系物理化学项目中，科罗拉多大学的Veronica Bierbaum博士将使用串联式流动余辉选择离子流管仪器研究气相离子-分子反应的动力学、机理和热化学。研究的主题包括简单体系中的质子转移，缔合分离反应中的同位素交换，水合离子亲核取代反应中的溶剂化和动力学同位素效应，大气中感兴趣的反应的速率系数和产物分布的测量，以及含卤素和含硫化合物的热化学数据的测定。对气相离子化学的研究使我们有机会对主要存在于溶液、固体或高层大气中的物种和过程有一个基本的了解。通过研究离子和中性原子或分子之间的反应，在没有周围溶剂或其他邻近物种的情况下，可以确定离子原子或分子的结构、反应性和热力学性质。应用范围广泛，从医疗和分析到环境。

In this project in the Physical Chemistry Program of the Chemistry Division, Dr. Veronica Bierbaum of the University of Colorado will study the kinetics, mechanisms, and thermochemistry of gas phase ion-molecule reactions using tandem flowing afterglow-selected ion flow tube instruments. Topics for study include proton transfer in simple systems, isotope exchange in associative detachment reactions, solvation and kinetic isotope effects in nucleophilic substitution reactions of hydrated ions, rate coefficient and product distribution measurments of reactions of atmospheric interest, and the determination of thermochemical data for halogen- and sulfur-containing compounds. %%% The study of gas phase ion chemistry affords the opportunity to obtain a fundamental understanding of species and processes which are naturally present primarily in solution, in solids, or in the upper atmosphere. By studying reactions between ionic and neutral atoms or molecules without surrounding solvent or other neighboring species, the structure, reactivity, and thermodynamic properties of the ionic atoms or molecules can be determined. Applications span a broad variety of fields, from medical and analytical to environmental.