Fundamental Aspects of the Surface Chemistry of Ice

冰表面化学的基本方面

• 批准号: 9200108
• 负责人: Jeffrey Roberts
• 金额: $ 20.8万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-05-01 至 1995-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9200108&HistoricalAwards=false
• 关键词: Fundamental; Aspects; Surface; Chemistry; Ice

In this project, supported jointly by the Analytical and Surface Chemistry Program and the Atmospheric Chemistry Program, Professor Roberts will study the interaction of small molecules with well-characterized ice surfaces. These ice surfaces will be made by epitaxial growth on platinum single crystal substrates, and characterized by reflection infrared and X-ray photoelectron spectroscopy. The sticking probability, adsorbed structure, and surface reactivity of a number of small molecules relevant to stratospheric ozone chemistry will be examined. Molecules such as hydrochloric acid, hypochlorous acid, and nitric acid will be studied, with a view toward understanding the effects of ice structure, adsorption kinetics, and surface reactions on the production of species important in stratospheric ozone depletion. %%% Reactions occurring on stratospheric ice particles are thought to dominate the chemistry which results in the destruction of ozone in the upper atmosphere. Very little is known about the basic chemistry of the ice surface, and the reactions of relevant small molecules on this surface. This research project will address questions of adsorption and reaction of these small molecules, primarily chlorine source molecules, on well-characterized ice surfaces. Basic information of this type is essential to a complete understanding and eventual remediation of the depletion of ozone in the upper atmosphere.

在这个项目中，由分析和 表面化学与大气化学 计划，罗伯茨教授将研究小的相互作用 具有良好特征的冰面的分子。 这些冰 表面将通过外延生长在铂单 晶体基板，其特征在于反射红外 和X射线光电子能谱。 粘附 概率，吸附结构和表面反应性， 与平流层臭氧有关的小分子数量 化学将被检查。 盐酸等分子 酸，次氯酸和硝酸将被研究， 了解冰结构影响的观点， 吸附动力学和表面反应的生产 在平流层臭氧消耗中起重要作用的物种。 %%% 人们认为平流层冰粒上发生的反应 来控制化学反应， 大气层上层的臭氧。 关于这一点，我们知之甚少。 冰表面的基本化学，以及 相关的小分子。 本研究 该项目将解决吸附和反应的问题， 这些小分子，主要是氯源分子， 特征鲜明的冰面 基本信息 类型对于完全理解和最终 补救高层大气臭氧的消耗。