Structural Properties of Weakly-Adsorbed Overlayers

9819977Diehl低能电子衍射和He原子散射实验将用来研究吸附原子在准晶表面上的吸附几何结构，并表征弱吸附原子在准晶表面上的吸附。这项研究计划集中于增加我们对引起简单吸附的平衡结构的基本相互作用和性质的理解，以及低维系统特有的相变。它还旨在增加我们对准晶结构的性质的了解，这些性质导致了准晶的特殊性质，如低摩擦系数和高硬度，这些性质对于机床和工具中耐磨涂层的发展是重要的。这项研究计划包括博士后研究人员、研究生和本科生研究人员，以及来自主要本科院校的两名教员。它包括与英国和芬兰的研究人员合作研究的重要组成部分。将进行%实验来研究晶体和准晶表面原子层的结构和其他物理性质。准晶是一种相对较新的固体，表面看起来特别坚硬、光滑。这些不同寻常的物理特性的起源还不是很清楚。这项研究的一部分涉及清洁准晶表面的研究和二维准晶层的生长，以确定导致这些不寻常的物理特性的准晶的性质。了解这些特性将有助于开发新材料，如机床和工具中的耐磨涂层。这项研究计划包括博士后研究人员、研究生和本科生研究人员，以及来自主要本科院校的两名教员。它包括与英国和芬兰的研究人员合作研究的重要组成部分。

9819977DiehlLow-energy electron diffraction and He-atom scattering experiments will be carried out to study the adsorption geometries of adsorbed atoms on nominally flat and vicinal crystalline surfaces, and to characterize the adsorption of weakly-adsorbed atoms on quasicrystalline surfaces. This research program centers on increasing our understanding of the fundamental interactions and properties which give rise to the equilibrium structures of simple adsorbates, and the phase transitions which are peculiar to low-dimensional systems. It also aims to increase our understanding of the properties of the quasicrystalline structure which give rise to the unusual properties of quasicrystals, such as low friction coefficients and high hardness, properties which are important to the development of wear-resistant coatings in machines and tools. This research program includes the participation of postdoctoral researchers, graduate and undergraduate researchers, as well as two faculty from primarily-undergraduate institutions. It includes a significant component of collaborative research with researchers in the UK and Finland. %%%Experiments will be carried out to study the structures and other physical properties of layers of atoms on crystalline and quasicrystalline surfaces. Quasicrystals are a relatively new type of solid which appear to have particularly hard, slippery surfaces. The origin of these unusual physical properties is not well understood. Part of this research involves the study of clean quasicrystal surfaces and the growth of two-dimensional quasicrystalline layers in order to identify the properties of the quasicrystalline sold which give rise to these unusual physical properties. Understanding these properties will facilitate the development of new materials such as wear-resistant coatings in machines and tools. This research program includes the participation of postdoctoral researchers, graduate and undergraduate researchers, as well as two faculty from primarily-undergraduate institutions. It includes a significant component of collaborative research with researchers in the UK and Finland.***