Microscopic Surface Diffusion of Molecular Chemisorbates

这项资助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不同位置的吸附和扩散的时间依赖性。利用红外光谱检测，可以确定分子反应位点的数量和类型。这将对理解形态不同的位点对表面化学反应性的作用产生影响。将构建脉冲分子束源，用于研究一氧化碳和一氧化氮在阶梯式铂表面的扩散。接下来，这项研究将转向具有单齿结合位点的更复杂的化学系统，腈。对红外信号进行校正，可以绝对确定特定地点的物种浓度。此外，模拟分子扩散动力学的理论合作将得到本工作实验结果的支持。

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.