HEATING AND BREAKING OF AD-MOLECULE BOND BY INELASTIC TUNNELING

被引：12
作者：
GAO, SW
机构：
[1] Department of Applied Physics, Chalmers University of Technology
来源：
SURFACE SCIENCE | 1994年 / 313卷 / 03期
关键词：
D O I：
10.1016/0039-6028(94)90064-7
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：
A two-mode model is presented to analyze the vibrational excitation of an adsorbed molecule in a scanning tunneling microscope, and to explore the possibility of breaking the ad-molecule bond by inelastic tunneling. Non-equilibrium heating between different modes occurs due to the differences in electron-vibration coupling and in the electronic resonance near the Fermi level. For CO/Cu(100), the stretch mode can be excited to a much higher temperature (approximately 1000 K) than the molecule-surface mode (approximately 100 K) at a current of 10(-7) A. Anharmonic coupling between the two modes leads to energy transfer from the highly excited stretch to the cooler molecule-surface bond, and influences the bond-breaking process drastically at the surface.
引用
收藏
页码：448 / 458
页数：11
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