Development of an Ultrafast Scanning Tunneling Microscope

超快扫描隧道显微镜的开发

• 批准号: 9300729
• 负责人: Eric Ganz
• 金额: $ 9.7万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-06-15 至 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9300729&HistoricalAwards=false
• 关键词: Development; Ultrafast; Scanning; Tunneling; Microscope

An ultra fast scanning tunneling microscope will be constructed to image atomic motions over small distances in ultrahigh vacuum. By optimizing the instrument for imaging of small areas (less than 100 A across) atomic resolution imaging will be achieved at ratesup to 10 msec per image for full images, or 100 usec per scan line for narrow images. These rates are 10 to 1000 times faster than currently available UHV instruments. The system will operate at sample temperatures up to and above 600 C. This will permit the observation of dynamical processes on material surfaces with much faster timescales than is currently possible. Samples will also be characterized by LEED. In particular, we will use this instrument to study atomic diffusion of Si adatoms during annealing of the Si(100)-2x1 reconstructed surface as an investigation of the fundamentals of molecular beam epitaxy. We will also study the motion of surface atoms during melting of the Ge(111)-c(2x8) reconstructed surface.

一个超快速扫描隧道显微镜将是 它被构造成在小距离内成像原子运动， 真空吸尘器。 通过优化成像仪器， 小区域（小于100埃）原子分辨率成像将 对于完整图像，以每图像10毫秒的速率实现，或100 对于窄图像，每扫描线usec。 这些比率是10比1000 比目前可用的UHV仪器快一倍。 系统 将在高达和高于600 ℃的样品温度下工作。 这 将允许观察材料上的动力学过程 比目前可能的时间表快得多的表面。 样品还将通过LEED进行表征。 特别是要 用该仪器研究了Si吸附原子在 Si（100）-2x1重构表面的退火， 分子束外延的基本原理的研究。 我们 还将研究熔化过程中表面原子的运动， Ge（111）-C（2x 8）重构表面。