Narushima Tetsuya, Kinahan Niall T, Boland John J
School of Chemistry, Trinity College Dublin, Dublin 2, Ireland.
Rev Sci Instrum. 2007 May;78(5):053903. doi: 10.1063/1.2736417.
We have developed a new combined measurement system to investigate the underlying origins of forces on solid state surfaces from the viewpoint of atomic surface morphology. This system consists of two main parts: the measurements of force based on displacements and detailed atomic resolution observations of the surface morphology. The former involves a large sample cantilever and a capacitive detection method that provide sufficient resolution to detect changes of a few meV/atom or pN/atom at surfaces. For the latter, a scanning tunneling microscope was incorporated to observe structural changes occurring on the surface of the cantilever sample. Although this combined observation is not trivial, it was accomplished by carefully designing sample dimensions while suppressing the self-oscillation of the cantilever. To demonstrate the performance of this system a preliminary study of the room temperature adsorption of Br(2) on the clean Si(111)-7x7 surface is presented.
我们开发了一种新的组合测量系统,从原子表面形态的角度研究固态表面力的潜在起源。该系统由两个主要部分组成:基于位移的力测量和表面形态的详细原子分辨率观测。前者涉及一个大样品悬臂梁和一种电容检测方法,该方法提供了足够的分辨率来检测表面上几毫电子伏特/原子或皮牛顿/原子的变化。对于后者,引入了扫描隧道显微镜来观察悬臂梁样品表面发生的结构变化。尽管这种组合观测并非易事,但通过精心设计样品尺寸并抑制悬臂梁的自振荡得以实现。为了证明该系统的性能,我们展示了对Br(2)在清洁的Si(111)-7x7表面上室温吸附的初步研究。