Grant For Exploratory Research: Femtosecond Time-Resolved Scanning Tunneling Microscopy

9311337谢勒在化学部实验物理化学计划探索性研究项目的小额资助中，谢勒将扫描隧道显微镜（STM）与飞秒脉冲激光系统相结合，以研究表面和界面上原子结构的时空特性。 将测量吸附或化学吸附到导电基底上的单分子和颗粒的相干特性。 泵浦-探测方法将用于获得几十飞秒的时间分辨率的吸附物的物理动力学，而STM作为分子和特定位点的光诱导的电导率变化的检测器。 %通过在这个研究项目下进行的实验结果，谢勒将在微观层面上更好地了解限制在表面上的分子的基本性质。 从这些研究中获得的信息和更广泛的视角有可能在原子水平上直接观察和控制化学过程。 这反过来又影响了材料的纳米级制造和发生在例如气体和固体之间的界面处的其他过程。 ***

9311337 Scherer In this Small Grant for Exploratory Research Project in the Experimental Physical Chemistry Program of the Chemistry Division, Scherer will interface a scanning tunneling microscope (STM) with a femtosecond-pulse laser system in order to investigate the temporal and spatial properties of atomic structures on surfaces and at interfaces. Coherence properties of single molecules and particles adsorbed or chemisorbed to conducting subtrates will be measured. Pump-probe methods will be used to obtain tens of femtoseconds time resolution of the photophysical dynamics of the adsorbate while the STM serves as the molecule and site-specific detector of the optically induced changes in conductivity. %%% Through the results of experiments conducted under this research program Scherer will obtain a better understanding on a microscopic level of the fundamental properties of molecules confined on surfaces. The information and broader perspective obtained from these studies have the potential for directly observing and controlling chemical processes at the atomic level. This in turn has implications for nanoscale fabrication of materials and other processes which occur at the interface between, for example, a gas and a solid. ***