Low temperature ultrahigh vacuum scanning tunneling/ atomic force microscope with tuning fork sensor

带音叉传感器的低温超高真空扫描隧道/原子力显微镜

• 批准号: 493870016
• 金额: --
• 依托单位: Justus-Liebig-Universität Gießen
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2022
• 资助国家: 德国
• 起止时间: 2021-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/493870016?language=en
• 关键词: Low; temperature; ultrahigh; vacuum; scanning

In the frame of the LOEWE Schwerpunkt „PriOSS – Principles of On-Surface Synbthesis“ the reactions of organic molecules on surface will be investigated. An essential technique for these investigations is imaging the molecules with an atomic force microscope, which, under certain conditions, allows the visualization of individual chemical bonds, inter- as well as intra-molecular. For this a scanning atomic force microscope with tuning fork sensor is suitable, working at 5 K in ultrahigh vacuum. The key for this extremely good resolution is functionalization of the probing tip with a carbon monoxide molecule, which is usually picked-up with the tip from the surface before the high resolution scan. Both, the process of the tip functionalization as well as the high resolution imaging of the molecules only work at sample temperatures at low cryogenic temperatures around 5 K. Furthermore, the scan process must be controlled by a very flexible, programmable electronic system, in order to be able to visualize 3-dimensional structures, also called 3D spectroscopy. A further important feature in the frame of the PriOSS projects is the simultaneous excitation of different harmonic oscillation of the sensor beam. These multi-frequency methods allow the (almost) independent but simultaneous recording of different force signals, which enables novel scanning procedures and gives deeper insight into the molecular force interactions. Very important are temperature and drift stability, in order to be able to perform long time scale measurements on molecules. The control electronics must be programmable, and allow for complex 3D spectroscopy measurements.

在LOEWE Schwerpunkt“PriOSS -表面合成原理”的框架内，将研究有机分子在表面上的反应。这些研究的一个基本技术是用原子力显微镜对分子进行成像，在某些条件下，原子力显微镜可以使分子间和分子内的单个化学键可视化。 为此，扫描原子力显微镜与音叉传感器是合适的，工作在5 K的真空中。这种极高分辨率的关键是用一氧化碳分子对探针进行功能化，通常在高分辨率扫描之前用探针从表面拾取一氧化碳分子。尖端功能化的过程以及分子的高分辨率成像都仅在约5 K的低温下的样品温度下工作。 此外，扫描过程必须由非常灵活的可编程电子系统控制，以便能够可视化三维结构，也称为3D光谱学。PriOSS项目框架中的另一个重要特征是同时激发传感器光束的不同谐波振荡。这些多频方法允许（几乎）独立但同时记录不同的力信号，这使得新的扫描程序，并提供更深入的了解分子力的相互作用。非常重要的是温度和漂移稳定性，以便能够对分子进行长时间尺度的测量。控制电子设备必须是可编程的，并允许复杂的3D光谱测量。