Surface Diffusive Motion in a Periodic and Asymmetric Potential

详细信息    查看全文

• 作者：Greg Pawin ; Kin L. Wong ; Ki-Young Kwon ; Robert J. Frisbee ; Talat S. Rahman ; Ludwig Bartels
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：November 19, 2008
• 年：2008
• 卷：130
• 期：46
• 页码：15244-15245
• 全文大小：145K
• 年卷期：v.130,no.46(November 19, 2008)
• ISSN：1520-5126

文摘

9,10-Dithioanthracene adsorbed on Cu(111) diffuses exclusively along the high-symmetry axis of the molecule−substrate system. Further reduction of the symmetry of the system by asymmetric methylation does not reduce the symmetry of the motion although it has a substantial effect on the diffusion rate (100-fold reduction) and renders the diffusion barrier asymmetric. This is in contrast to the behavior expected of a classical particle, and it provides a direct single-molecule-scale vista on the validity of The Principle of Microscopic Reversibility first formulated by Tolman in 1924, which despite its fundamental role has attracted little visualization.