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

酸性、碱性和原子气液界面碰撞和反应的分子束研究

• 批准号: 9804698
• 负责人: Gilbert Nathanson
• 金额: $ 50.33万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9804698&HistoricalAwards=false
• 关键词: Molecular; Beam; Studies; Collisions; Reactions

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.

在这个由化学系实验物理化学计划支持的项目中，Nathanson将继续他对气液相互作用的研究。 在这项研究中，将单能原子或分子束引导到真空中的液体表面，并使用飞行时间质谱仪（TOFMS）监测散射产物的身份、平移能量和方向。 获得关于能量转移、反应概率与冲击能量或方向的关系以及解吸的反应产物的身份的信息。 Nathanson将研究酸度跨越35年的液体。 在涉及共沸硫酸，多磷酸，中性和碱性溶液的甘油或熔融氢氧化钠的一组实验中，他将研究能量耗散和捕获对气体分子进入轨道的依赖性以及分子的命运作为酸度的函数。 他还计划研究单分子膜的作用及其对能量传递和表面渗透的影响。液-气界面的化学反应动力学对于理解许多不同的气-液反应有直接的相关性，包括在大气化学中重要的臭氧-空穴形成，使用催化剂的工业过程，以及活生物体的呼吸。