Development of a High Resolution Orientation Imaging Microscope

小行星9503490 低能电子显微镜（LEEM）是一种新的材料表征技术，它允许低能电子探测固体的外层。 使用LEEM，首先可以对表面形貌进行成像，其次可以观察近表面结构的周期性衍射，第三可以使用光电子进行成像，从而探测电子结构的空间变化。 这些仪器非常适合从高温到室温以下的样品检测。 原位动力学研究提供了特殊的机会，不仅可以在真实的时间内观察体现象，还可以观察表面现象。 由于LEEM仪器在超真空的极限下运行，表面保持数小时未受污染，因此可以获得表面结构和反应的动力学。 另一个主要的资产是在样品附近的接入端口，可以容纳分子束源进行外延生长之前或期间的观察。 提供这些强大的功能组合的商用机器现在才开始可用。 因此，时间已经成熟，专门应用LEEM仪器的材料研究问题的关键利益的材料研究界。 这台机器将用于研究在精确定制的样品表面上生长、氧化或其他反应期间发生的动力学阶跃流动过程的真实的时间成像。 我们对材料本身的关注有望记录和系统化各种晶体类型的这种类型的信息，除了发现通常奖励这种类型的探索性研究的新工艺之外。 这（LEEM）将被放置在伊利诺伊大学EpiCenter，一个致力于金属，陶瓷和半导体的晶体生长和表面处理的中央设施。

9503490 Flynn The Low Energy Electron Microscope (LEEM) is a recently- available materials characterization technique which allows low energy electrons to probe the outer layers of a solid. With LEEM it is possible first to image surface topography, second to observe diffraction from the periodicities of the near-surface structure, and third to image using photoelectrons and thus probe the spatial variation of electronic structure. These instruments are very well adapted to the examination of samples through the range from high temperature to below room temperature. In situ dynamical studies offer special opportunities to view in real time not only bulk but also surface phenomena. As LEEM instruments operate in the limit of ultrahigh vacuum where surfaces remain uncontaminated for many hours, the dynamics of surface structure and reactions thus become accessible. A further major asset is the availability in the vicinity of the sample of access ports that can house molecular beam sources for eptiaxial growth conducted before or during observations. Commercial machines which offer these powerful combinations of capabilities are just now becoming available. The time is therefore ripe for the dedicated application of a LEEM instrument to materials research problems of critical interest tot the materials research community. This machine will be used to study the real time imaging of kinetic step flow processes that occur during growth, oxidation or other reaction on the surfaces of precisely tailored samples. Our focus on the materials themselves promises to document and systematize information of this type for a variety of crystal types, in addition to the discoveries of new processes that typically rewards this type of exploratory research. This (LEEM) will be placed in the University of Illinois EpiCenter, a central facility dedicated to the crystal growth and surface processes of metals, ceramics, and semiconductors.