Quantum state resolved studies of gas-surface interaction dynamics

在这个由化学部实验物理化学计划资助的项目中，SITZ将执行涉及分子氢和氘从反应性过渡金属表面散射的状态到状态的实验。我们将研究在氢/铜和氢/钯体系中，平移、转动和振动运动以及分子排列在决定散射事件结果方面的相对重要性。受激拉曼散射将用于制备以选定的旋转态和振动态入射到表面的氢分子。通过多光子电离，散射分子将以量子态特有的方式被探测到。通过利用这里研究的简单系统，将有可能与理论进行明确的比较。完全高分辨率的测量为表面动力学提供了新的见解。本项目中获得的此类实验结果为测试现有模型和理论提供了关键数据，并有助于推动新模型和理论的开发。众所周知，表面上各种原子的存在可以导致表面反应的毒化或促进，但这些影响还没有完全被理解。与理论家的合作也有望使人们能够预测性地了解最终将影响催化反应过程和其他技术应用的基本气体表面过程。PI实验室的学生接受了使用最先进的激光和真空技术的培训。

In this project funded by the Experimental Physical Chemistry Program of the Chemistry Division, Sitz will perform state-to-state experiments involving molecular hydrogen and deuterium scattering from reactive transition metal surfaces. The relative importance of translational, rotational, and vibrational motion and molecular alignment in determining the outcome of scattering events in hydrogen/copper and hydrogen/palladium systems will be investigated. Stimulated Raman scattering will be used to prepare hydrogen molecules incident on the surface in selected rotational and vibrational states. Scattered molecules will be detected in a quantum state specific manner by multiphotonionization. By exploiting the simple systems studied here, a definitive comparison with theory will be possible.Fully highly resolved measurements provide new insight into surface dynamics. Experimental results of the kind obtained in this project provide critical data for testing existing models and theories and help motivate the development of new ones. It is known that the presence of various atoms on a surface can lead to either poisoning or promotion of surface reactions, but these effects are not fully understood. The collaboration with theoreticians is also expected to enable a predictive understanding of fundamental gas-surface processes that will ultimately impact catalytic reaction processes and other technological applications. Students in the PI's laboratory are trained in the use of state-of-the-art laser and vacuum technologies.