Acquisition of Momentum Resolved Electron Energy Loss Spectrometer for Surface Research

该奖项将用于构建一个表面分析系统 能够测量材料的表面振动和声子 作为动量的函数，在一个 温度范围从20开尔文到800开尔文。 同时 电子和结构性质的表征 表面将是可能的。 曲面的基本性质 简单金属、半导体、绝缘体和薄 薄膜将被调查，以及振动模式的 表面缺陷和吸附物。 提高分辨率和信号 将允许获得详细的声子色散曲线， 各种表面结构。 表面声子谱将是 用低能电子理论与几何结构相关联 衍射、扫描隧道显微镜、X射线和离子 散射，并与电子结构，使用XPS，AES， 角分辨光电发射 实验紧密耦合 晶格动力学的理论计算结果将是 贯彻 这台仪器将是世界上第一台 美国的

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.