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将进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实验。 平移，旋转和振动运动和分子排列在确定的结果在氢/铜和氢/钯系统中的散射事件的相对重要性将被调查。 受激拉曼散射将用于制备入射到表面上的选定的旋转和振动状态的氢分子。 散射的分子将通过多光子电离以量子态特定的方式被检测到。 通过利用这里研究的简单系统，与理论进行明确的比较将是可能的。完全高分辨率的测量提供了对表面动力学的新见解。 该项目中获得的实验结果为测试现有模型和理论提供了关键数据，并有助于激励新模型和理论的开发。 已知表面上各种原子的存在可导致中毒或促进表面反应，但这些效应尚未完全理解。 与理论家的合作也有望实现对基本气体表面过程的预测性理解，这些过程最终将影响催化反应过程和其他技术应用。 PI实验室的学生接受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.