Development of STM for structure analysis of surfaces

我们设计了一种特殊的扫描隧道显微镜，它可以与特高压高分辨率电子显微镜结合来研究重建的表面结构和吸附物形成的表面结构。这是为了获得STM和电子显微镜的互补信息；前者不仅给出几何结构，而且给出电子结构；前者只看到顶部表面，而后者在顶部表面下给出原子排列；前者只有有限的视野。为此构建的STM使我们能够看到石墨和辉钼矿表面的微观结构：在它们的图像中，可以分辨出三角形和/或六边形排列的亮点，对应于高电荷密度的原子位置。本压电驱动器的最大扫描面积为1000x500 A，最大扫描速度为10秒/帧。行扫描和帧扫描是计算机控制的。附在STM上的是试样的加热能力，这是清洁表面和观察原位相变过程所需要的。STM支架可以转移到特高压显微镜下，显微镜可以对STM观察到的表面和尖端进行成像。

We designed a special scanning tunneling microscope which can be cobmined with the UHV high-resolution electron microscope to study reconstructed surface structures and those formed by adsorbates. This is to obtain complementary informations from STM and electron microscopy; the former gives not only geometric structure but also electronic structures; the former only see the top surface while the latter gives atomic arrangement underneath the top surface; the former has only a limited area of view.A STM constructed for such purpose enabled us to see the stomic structure of graphite and molybdenite surfaces: In their images trigonal and/or hexagonal arrangements of bright dots, corresponding to atom positions of high charge density, are resolved< The maximum scanning area of the present piezo drive is 1000x500 A and the maximum speed of scan is 10 sec./frame. The line scan and frame scan are computer controlles.Facilitied attached to the STM is heating capability of the specimens, which is needed to clean the surfaces and to observe phase transition processes in-situ. The STM holder can be trnasferred to the UHV microscope and the surface area which has been observed by STM and also the tip can be imaged by microscope.