Surface Diffusion and Reaction Kinetics on Single-Crystal Metal Surfaces

这项建议属于分析和表面化学的一般领域，以及表面动力学和激光解吸的子领域。利用激光诱导热脱附(LITD)技术研究了金属和化学添加剂对表面反应动力学的影响。研究了铜、钾添加剂对甲醇在Ru单晶(100)面上的表面扩散和反应动力学的影响。通过改变添加剂的覆盖度来调节表面电子结构，可以逐步改变扩散和反应的速率。控制表面动力学参数的因素将被阐明。表面上基本过程的动力学是微观上理解表面化学和物理的核心。表面动力学现象在预测和控制多相催化中也起着至关重要的作用。这些研究中将进行的动力学测量将有助于阐明各个基本步骤在确定反应动力学中的作用，并为理论模型的检验提供实验基础。

This proposal is in the general area of analytical and surface chemistry and in the subfields of surface dynamics and laser desorption. The effects of metallic and chemical additives on surface reaction kinetics will be investigated using laser-induced thermal desorption (LITD) techniques. Effects of copper and potassium additives on the surface diffusion and reaction kinetics of methanol on the (100) face of ruthenium single crystals will be explored. Rates of diffusion and reaction will be altered progressively by modulating the surface electronic structure with varying additive coverage. Factors that control surface kinetic parameters will be elucidated. The kinetics of elementary processes on surfaces are central to a microscopic understanding of surface chemistry and physics. Surface kinetic phenomena also play an essential role in predicting and controlling heterogeneous catalysis. The kinetic measurements that will be carried out in these studies will help to elucidate the role of individual elementary steps in determining reaction kinetics and provide an experimental basis for testing of theoretical models.