Electron Optical Studies of Crystal Disorders, Defects and Surfaces

晶体无序、缺陷和表面的电子光学研究

• 批准号: 8810238
• 负责人: John Cowley
• 金额: $ 48.45万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8810238&HistoricalAwards=false
• 关键词: Electron; Optical; Studies; Crystal; Disorders

This grant is a renewal for research by Professor John Cowley on the use of high resolution electron microscopy for the investigation of the structure of defects and surfaces of ceramic and electronic materials. The current research concentrates on a range of new techniques and the further advancement of established techniques for the more detailed atomic description of the structures and chemical compositions of crystal surfaces and atomic disorder in thin films and small particles. The effects of surface resonance channelling, which confine the electron beam to the topmost lines or planes of atoms on crystal surfaces will be investigated for the reflection electron microscope. These effects are observed in the Kikuchi line patterns in reflection high energy electron diffraction, and they provide for the basis for the technique developed by this group called electron energy loss spectroscopy. These new techniques allow micro-chemical and atomic analysis of surface monolayers. These techniques are being applied to studies of surfaces of oxide ceramics (e.g. magnesium oxide) and semiconductors (e.g. silicon and gallium arsenide). Two new ultra high vacuum high resolution electron microscopes are to be used for this study. The research of Professor Cowley has been at the leading edge of high resolution electron microscopy for years. It has led to several of the techniques in use worldwide today. The present research will continue to advance these techniques, and their use in characterization of ceramics and electronic materials on the atomic scale. This group at Arizona State University continues to train graduate students and post doctoral students in the use of these advanced analytical techniques.

这项补助金是约翰教授研究的延续 Cowley关于使用高分辨率电子显微镜 陶瓷缺陷和表面结构的研究 电子材料。 目前的研究集中在 一系列新技术和进一步发展 更详细的原子描述的既定技术 晶体表面的结构和化学成分 以及薄膜和小颗粒中的原子无序。 的 表面共振沟道效应，这限制了 电子束射到晶体上原子的最高线或最高面 表面将研究反射电子 显微镜 这些效应在菊池线中观察到 反射高能电子衍射中的图案，以及 它们提供了这种技术发展的基础， 电子能量损失谱。 这些新 技术允许对表面进行微观化学和原子分析， 单层。 这些技术正被应用于研究 氧化物陶瓷（例如氧化镁）的表面， 半导体（如硅和砷化镓）。 两个新 超高真空高分辨率电子显微镜将是 用于本研究。 考利教授的研究一直处于领先地位 多年来一直是高分辨率电子显微镜的前沿。 它有 导致了今天世界范围内使用的几种技术。 的 目前的研究将继续推进这些技术， 它们在陶瓷和电子材料特性方面的应用 原子尺度的材料。 亚利桑那州立大学的这个小组 大学继续培养研究生和博士后 学生使用这些先进的分析技术。