Ion-Molecule Reactions in Gas-Phase Clusters and Buffer Gas Flows

在这个项目中的物理化学程序的化学 亨德里克斯学院的大卫黑尔斯教授将研究这种依赖性 气相离子分子反应对离子内能的影响。 到 为了完成这项任务，将使用两种不同的实验技术。 在第一种情况下，将寻找发生反应的证据， 在超音速膨胀产生的电离分子团中 并通过电子碰撞电离。 离子的碰撞弛豫 集群涉及潜在的反应性相互作用。 第二种技术 包括在高压流管内的放电电离 气体混合物膨胀到真空中。 在扩张前 离子与缓冲层发生许多热化碰撞 气体与潜在反应分子的碰撞。 的离子 用飞行时间质量探测流出流管的流体 光谱仪 两种技术之间的结果差异将 根据反应的不同环境进行分析， 发生。 这项研究涉及大学生的参与 学生 离子-分子化学是化学研究中一个被广泛关注的领域。 当代反应化学 这项研究将有助于 更好地了解不同环境中发生的反应过程， 气相环境，其结果将在应用中使用 例如大气化学和其他。 这项研究将是 在本科学院进行，并将涉及本科生 学生

In this project in the Physical Chemistry program of the Chemistry Division, Prof. David Hales of Hendrix College will study the dependence of of gas-phase ion-molecule reactions on ion internal energy. To accomplish this task two different experimental techniques will be used. In the first, evidence will be sought for reactions which take place within ionized clusters of molecules produced in a supersonic expansion and ionized by electron impact. Collisional relaxation of an ion in a cluster involves potentially reactive interactions. The second technique involves discharge ionization within a high pressure flow tube prior to expansion of the gas mixture into a vacuum. In the pre-expansion environment the ions undergo many thermalizing collisions with the buffer gas for each collison with a potenntially reactive molecule. The ions which exit the flow tube are probed with a time of flight mass spectrometer. Differences in the results between the two techniques will be analyzed in terms of the different environments in which the reactions take place. This research involves the participation of undergraduate students. Ion-molecule chemistry is one of the intensely pursued areas of contemporary reaction chemistry. This research will contribute to a better understanding of the reaction processes that occur in different gas phase environments, and the results will be of use in applications such as atmospheric chemistry and others. This research will be conducted in an undergraduate college and will involve undergraduate students.