Ion Scattering Studies of Surface Structure and Growth

使用中能离子散射（MEIS）和扫描隧道显微镜（STM）将确定清洁表面和吸附物覆盖表面的结构。银和铜有序金属表面的振动振幅将在非谐波状态下测量，并与结构变化相关。进一步的研究将集中在经历位移表面相变和氧化物上的金属覆盖层的系统上。对这些效应的原子性理解可以对许多应用领域产生有益的影响，例如磁性薄膜、化学钝化涂层、摩擦学和双金属催化剂。% % % %这些研究的目标是确定清洁和吸附物覆盖表面的几何和振动结构。我们的主要实验技术是中能离子散射，这是一种非常强大但不广泛使用的测定表面结构的定量方法。要研究的具体系统包括银和铜的低指数表面，以及氧化物表面的金属覆盖层。这些实验将有助于理解新兴技术，如双金属催化剂、光学和磁性薄膜、化学钝化涂层和摩擦学。* * *

9408578 Gustafsson The structure of clean and adsorbate covered surfaces using medium energy ion scattering (MEIS) and scanning tunneling microscopic (STM) will be determined. The surface vibrational amplitudes of well ordered metal surfaces of silver and copper will be measured in the anharmonic regime and correlated with structural changes. Further studies will focus on systems that undergo displacive surface phase transitions and metal overlayers on oxides. An atomistic understanding of these effects can have a beneficial impact on a large number of areas of applied nature, such as magnetic films, chemically passive coating, tribology, and bimetallic catalysts. % % % % The goal of these studies is to determine the geometric and vibrational structure of clean and adsorbate covered surfaces. Our main experimental technique is medium energy ion scattering, a very powerful, but not widely available, quantitative method for the determination of surface structure. The specific systems to be studied include low index surfaces of silver and copper, as well as metal overlayers on oxide surfaces. The experiments will contribute towards an understanding of emerging technologies, like bimetallic catalysts, optical and magnetic films, chemically passive coatings and tribology. ***