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

9311337 Scherer在化学部实验物理化学计划的探索性研究项目中，Scherer将把扫描隧道显微镜（STM）与飞秒脉冲激光系统结合起来，以研究表面和界面上原子结构的时间和空间特性。将测量吸附或化学吸附到导电衬底上的单分子和粒子的相干性。泵浦探针方法将用于获得吸附质光物理动力学的数十飞秒时间分辨率，而STM则作为光诱导电导率变化的分子和特定位点检测器。通过在这个研究项目下进行的实验结果，Scherer将在微观层面上更好地理解局限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阔的视角有可能在原子水平上直接观察和控制化学过程。这反过来又对纳米级材料制造和其他发生在例如气体和固体之间界面的过程产生影响。＊＊＊

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. ***