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介绍了锁定放大技术应用于扫描隧道显微镜 (STM)中调制隧道间隙而获得物质表面原子的局域势垒分布的原理 ,并给出了高定向石墨的观测结果 ,与恒电流模式下STM图像相比较 ,具有分辨率高、针尖的影响小、抗干扰性能强的特点。另外 ,根据局域势垒分布还可区分不同的原子 ,给解释STM原子图像提供了一种手段。
The principle of the local barrier distribution obtained by using the locking amplification technology in the tunneling of scanning tunneling microscope (STM) to obtain the atom of the surface of the material is introduced. The observation results of the highly oriented graphite are also given. Compared with the STM image in the constant current mode Comparison, with high resolution, the impact of small tip, anti-jamming performance characteristics. In addition, according to the local barrier distribution can also distinguish different atoms, to explain the STM atomic image provides a means.