Acquisition of Momentum Resolved Electron Energy Loss Spectrometer for Surface Research

购买用于表面研究的动量分辨电子能量损失谱仪

• 批准号: 9112808
• 负责人: E. Ward Plummer
• 金额: $ 15.3万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-15 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9112808&HistoricalAwards=false
• 关键词: Acquisition; Momentum; Resolved; Electron; Energy

This award will be used to construct a surface analytical system capable of measuring surface vibrations and phonons of materials with sub-meV energy resolution, as a function of momentum, over a temperature range from 20 Kelvins to 800 Kelvins. Simultaneous characterization of electronic and structural properties of surfaces will be possible. The fundamental properties of surface phonons for simple metals, semiconductor, insulators, and thin films will be investigated as well as the vibrational modes of surface defects and adsorbates. The improved resolution and signal will allow detailed phonon dispersion curves to be obtained for various surface structures. The surface phonon spectra will be correlated with the geometrical structure using Low Energy Electron Diffraction, Scanning Tunneling Microscopy, X-ray and Ion scattering, and with the electronic structures using XPS, AES, and Angle-resolved photoemission. Close coupling of experimental results to theoretical calculations of the lattice dynamics will be carried out. This instrument will be the first one of it's kind in the United States.

该奖项将用于构建一个表面分析系统，能够在 20 开尔文至 800 开尔文的温度范围内测量材料的表面振动和声子，能量分辨率为亚兆伏（MeV），作为动量的函数。 同时表征表面的电子和结构特性将成为可能。 将研究简单金属、半导体、绝缘体和薄膜的表面声子的基本性质以及表面缺陷和吸附物的振动模式。 改进的分辨率和信号将允许获得各种表面结构的详细声子色散曲线。 表面声子光谱将使用低能电子衍射、扫描隧道显微镜、X 射线和离子散射与几何结构相关，并使用 XPS、AES 和角分辨光电发射与电子结构相关。 将实验结果与晶格动力学的理论计算紧密结合。 该仪器将是美国第一个此类仪器。