Molecular Beam Studies of Collisions and Reactions at Acidic, Basic, and Atomic Gas-Liquid Interfaces

在化学学部实验物理化学项目的支持下，Nathanson将继续他对气液相互作用的研究。在这项研究中，原子或分子的单能束在真空中指向液体表面，并使用飞行时间质谱（TOFMS）监测散射产物的身份，平动能和方向。获得了能量传递、反应概率与冲击能量或方向的信息，以及解吸反应产物的特性。内特森将研究35年间酸度的液体。在一组涉及共沸水硫酸、多磷酸、中性和碱性甘油溶液或熔融氢氧化钠的实验中，他将研究能量耗散和捕获对气体分子进入轨迹的依赖，以及分子的命运作为酸度的函数。他还计划研究单层膜的作用及其对表面能量传递和穿透的影响。液-气界面的化学反应动力学与理解许多不同的气-液反应直接相关，包括大气化学中重要的臭氧空洞形成、使用催化剂的工业过程和生物体的呼吸作用。

In this project supported by the Experimental Physical Chemistry Program of the Chemistry Division, Nathanson will continue his investigations of gas-liquid interactions. In this research a monoenergetic beam of atoms or molecules is directed at a liquid surface in vacuum, and the identity, translational energy and direction of the scattered products is monitored using time-of-flight mass spectrometry (TOFMS). Information on energy transfer, reaction probability vs. impact energy or direction, and the identity of the desorbed reaction products is obtained. Nathanson will study liquids spanning 35 decades in acidity. In one set of experiments involving azeotropic sulfuric acid, polyphosphoric acid, neutral and basic solutions of glycerol or molten sodium hydroxide, he will investigate the dependence of energy dissipation and trapping on incoming trajectory of a gas molecule and the fate of the molecule as a function of acidity. He also plans to examine the role of monolayers and their effect on energy transfer and penetration of the surface.Chemical reaction dynamics at liquid-vapor interfaces is of direct relevance for understanding many different gas-liquid reactions, including ozone-hole formation important in atmospheric chemistry, industrial processes using catalysts, and respiration in living organisms.