Scanning tunneling microscope-induced molecular motion and its effect on the image formation

被引:56
|
作者
Bohringer, M
Schneider, WD
Berndt, R [1 ]
机构
[1] Rhein Westfal TH Aachen, Inst Phys, D-52056 Aachen, Germany
[2] Univ Lausanne, Inst Phys Expt, CH-1015 Lausanne, Switzerland
关键词
aromatics; friction; low index single crystal surfaces; scanning tunneling microscopy; silver; surface diffusion;
D O I
10.1016/S0039-6028(98)00151-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of tip-induced molecular motion on the appearance of scanning tunneling microscope (STM) images of anthracene on Ag(110) was investigated for various tunneling parameters and at various temperatures. At 50 K, isolated molecules can be imaged at a high tunneling resistance. For an increased tip-molecule interaction at a decreased resistance, apparent one-dimensional and two-dimensional molecular superstructures arise in the STM images that are due to an interplay between tip-induced motion, transient binding at specific substrate sites and repeated imaging of a molecule. At an even higher tip-molecule interaction strength, molecules can be dragged over the surface such that an atomically resolved substrate lattice is discernible. The slid molecule acts as an amplifier of the charge corrugation of the metallic surface. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:72 / 85
页数:14
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