Liquid Microjet Studies of Collisions and Reactions at the Surfaces of Aqueous Solutions

在这个由化学部门化学结构、动力学和机制项目资助的项目中，威斯康星大学麦迪逊分校的Gilbert Nathanson教授将把液体微射流与分子束结合起来，探索挥发性水溶液表面的碰撞和反应。这些气液散射实验将通过在真空中引导一束原子或分子在液体射流表面，并用质谱仪监测产物的特性、能量和反应时间来进行。液体微射流比人的头发还窄，周围只有一层薄薄的蒸汽毯，允许使用纯、碱性和咸水溶液进行散射实验，蒸汽压高达几托。这项拟议中的研究致力于研究酸性气体如DCl和氧化性气体如F2是如何在地表或其附近与水分子和离子发生反应的。长期目标是通过探索本体溶剂化的界面类似物、“相似物溶解相似物”规则、质子转移、酸解离和氧化还原来发展气-水反应的分子图谱。该项目通过其研究、指导和推广活动造福社会。从科学上讲，这个项目将有助于揭示气体和水溶液在工业和环境中的反应方式。它将同时为来自不同背景的研究生和本科生提供指导。在本研究中获得的熟悉度将进一步用于提高普通化学课的水性化学，并通过动手表面化学研讨会吸引K-12学生和他们的家长。

In this project, funded by the Chemical Structure, Dynamics, and Mechanisms Program of the Chemistry Division, Prof. Gilbert Nathanson of the University of Wisconsin-Madison will couple liquid microjets with molecular beams to explore collisions and reactions at the surfaces of volatile aqueous solutions. These gas-liquid scattering experiments will be performed by directing a beam of atoms or molecules at the surface of a liquid jet in vacuum and monitoring the identities, energies, and reaction times of the products with a mass spectrometer. Liquid microjets are narrower than a human hair and are surrounded by only a thin vapor blanket, permitting scattering experiments to be carried out using pure, basic, and salty water solutions with vapor pressures up to several Torr. The proposed research is dedicated to learning how acidic gases such as DCl and oxidizing gases such as F2 react with water molecules and ions at or near the surface. The long term objective is to develop a molecular picture of gas-water reactions by exploring the interfacial analogs of bulk solvation, the "like dissolves like" rule, proton transfer, acid dissociation, and oxidation-reduction.This program benefits society through its research, mentoring, and outreach activities. Scientifically, this program will help reveal the ways in which gases and aqueous solutions react industrially and in the environment. It will concurrently provide a setting to mentor graduate and undergraduate students from a wide range of backgrounds. The familiarity gained in this research will further be used to improve General Chemistry classes on aqueous chemistry and to engage K-12 students and their parents through hands-on surface chemistry workshops.