Surface Chemistry of Group VIII Transition Metals

该项目由分析和表面化学计划支持，涉及加州大学圣巴巴拉分校温伯格教授的实验室开展的超高真空表面化学的广泛课题。使用原子氢和原子氧源来探索在特征良好的第VIII族金属表面上的Eley-R Ideas反应的细节是这项工作的主要重点。电子损失光谱分辨率增强的数字处理方法的发展使这些表面上中间体的振动光谱表征成为可能。用时间分辨振动光谱定量了小分子在这些过渡金属表面的吸附辅助脱附过程，并用分子束方法探索了氧和其他小分子吸附的通量依赖性。这项工作为设计和理解重要的催化和电子设备处理技术提供了必要的知识基础。本工作的重点是对铂、铱和钚表面的表面反应化学反应机理进行详细研究。实验方法的发展和模型反应体系的检验相结合，可以更清楚地了解表面反应的机理和所涉及的中间体。这些知识在催化和电子设备制造工艺的设计和实施中被证明是有用的。

This project, supported in the Analytical and Surface Chemistry Program, addresses a broad range of topics in ultra high vacuum surface chemistry carried out in Professor Weinberg's laboratory at the University of California-Santa Barbara. The use of atomic hydrogen and atomic oxygen sources to probe the details of Eley-Rideal reactions at well characterized Group VIII metal surfaces is a major focus of the work. Vibrational spectroscopic characterization of intermediates on these surfaces is enabled by the development of digital processing methods for resolution enhancement in electron loss spectroscopy. Time resolved vibrational spectroscopy is used to quantify the process of adsorption assisted desorption of small molecules on these transition metal surfaces, and molecular beam methods are used to probe the flux dependence of adsorption of oxygen and other small molecules. This work provides the knowledge base necessary for the design and understanding of important catalytic and electronic device processing technologies. The detailed study of the mechanisms of surface reaction chemistry on platinum, iridium, and ruthenium surfaces forms the focus of this work. A combination of experimental method development and examination of model reaction systems provides a clearer understanding of the mechanisms of surface reactions and the intermediates involved. This knowledge proves useful in the design and implementation of catalytic and electronic device manufacturing processes.