Acquisition of an Advanced Surface Microscopy Facility

购置先进的表面显微镜设备

• 批准号: 9512231
• 负责人: Shirley Chiang
• 金额: $ 66.5万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-01 至 1998-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9512231&HistoricalAwards=false
• 关键词: Acquisition; Advanced; Surface; Microscopy; Facility

9512231 Chiang An advanced surface microscopy facility, consisting of an ultrahigh vacuum low energy electron microscope (LEEM) and a ultrahigh vacuum scanning tunneling microscope (STM) installed within the same vacuum system with sample transfer between the two instruments, will be established. The combination of the two instruments, LEEM and STM, within the same ultrahigh vacuum environment will enable the structural study of the surfaces of materials with both atomic resolution (STM) and in real time (LEEM). Both microscopes will permit control of the sample temperature during imaging and deposition of metals and adsorbates. The facility will be used by eleven investigators and their research groups to study surface properties in several key areas. These include: (1) dynamics of surface structural changes, such as nucleation and growth of metal, semiconductor, and oxide overlayers; (2) structural effects on adsorbates, such as segregation, diffusion, and reactivity; (3) synthesis and characterization of nanoscale materials, such as quantum dots, thin-film fullerene polymers, and nanoclusters. %%% Two complementary types of surface microscopes, a low energy electron microscope and a scanning tunneling microscope, will be utilized to probe surface systems with varying spatial and time resolution as a function of important parameters such as temperature and coverage of adsorbates. The possibility exists to image an important class of catalysts and simultaneously investigate their reactivities and catalytic properties. ***

将建立一个先进的表面显微镜设备，包括一台超高真空低能电子显微镜（LEEM）和一台超高真空扫描隧道显微镜（STM），安装在同一真空系统中，并在两台仪器之间进行样品传输。LEEM和STM这两种仪器的结合，在同一个超高真空环境中，将使材料表面的结构研究具有原子分辨率（STM）和实时（LEEM）。这两种显微镜都允许在成像和金属和吸附剂沉积过程中控制样品温度。该设施将被11名研究人员及其研究小组用于研究几个关键区域的表面特性。这些包括：(1)表面结构变化的动力学，如金属、半导体和氧化物覆盖层的成核和生长；(2)结构对吸附物的影响，如偏析、扩散和反应性；(3)纳米材料的合成与表征，如量子点、薄膜富勒烯聚合物和纳米团簇。两种互补类型的表面显微镜，低能电子显微镜和扫描隧道显微镜，将被用来探测具有不同空间和时间分辨率的表面系统，这是一个重要参数，如温度和吸附物覆盖范围的函数。有可能对一类重要的催化剂进行成像，同时研究它们的反应性和催化性能。＊＊＊