Microscopic Surface Diffusion of Molecular Chemisorbates

分子化学山梨酯的微观表面扩散

• 批准号: 8921186
• 负责人: Janice Reutt-Robey
• 金额: $ 26.95万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8921186&HistoricalAwards=false
• 关键词: Microscopic; Surface; Diffusion; Molecular; Chemisorbates

This grant is in the general area of analytical and surface chemistry and in the subfield of dynamic reaction studies at metal surfaces. Professor Janice Reutt-Robey of the University of Maryland will use a unique pulsed molecular beam source to observe the time dependence of adsorption and diffusion of molecules at specific topologically distinct sites on platinum single crystal surfaces. Using infrared spectroscopic detection the amounts and types of molecular reactions sites will be determined. This will have impact on the understanding of the role of morphologically distinct sites on surface chemical reactivity. The pulsed molecular beam source will be constructed and used to study the diffusion of carbon monoxide and nitrogen monoxide over stepped platinum surfaces. The study will then move to more chemically complex systems, nitriles, with monodentate binding sites. Calibration of the infrared signal will allow absolute determination of the concentrations of species at specific sites. Further, theoretical collaboration to simulate the dynamics of molecular diffusion will be supported by the experimental results from this work.

这笔赠款是在分析和表面化学的一般领域，以及在金属表面的动态反应研究的子领域。马里兰大学的Janice Reutt-Robey教授将使用一种独特的脉冲分子束源来观察分子在铂单晶表面特定拓扑结构不同位置的吸附和扩散的时间依赖性。使用红外光谱检测将确定分子反应位置的数量和类型。这将对理解形态上不同的位置对表面化学反应的作用产生影响。脉冲分子束源将被用来研究一氧化碳和氮氧化物在阶梯状铂表面的扩散。然后，这项研究将转移到化学上更复杂的体系，即具有单齿结合位点的氰化物。红外信号的校准将允许绝对确定特定地点的物种浓度。此外，这项工作的实验结果将支持模拟分子扩散动力学的理论合作。