Direct observation of surface diffusion of large organic molecules at metal surfaces: PVBA on Pd(110)

被引:90
作者
Weckesser, J [1 ]
Barth, JV [1 ]
Kern, K [1 ]
机构
[1] Ecole Polytech Fed Lausanne, Inst Phys Expt, CH-1015 Lausanne, Switzerland
关键词
D O I
10.1063/1.478430
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 bonding and surface diffusion of 4-trans-2-(pyrid-4-yl-vinyl) benzoic acid (PVBA) on Pd(110) was investigated by variable temperature scanning tunneling microscopy at sample temperatures between 300 and 450 K. PVBA is a large organic molecule designed for nonlinear optics applications. At low coverages single PVBA molecules are randomly distributed at the surface where they bind diagonally to three neighboring Pd-rows, leading to four equivalent adsorption configurations. The "dog-bone'' molecular structure could be resolved. The molecules' surface diffusion is strictly one-dimensional along the close-packed [1 (1) over bar 0]-direction of the surface Pd atomic rows and obeys an Arrhenius law with an activation barrier of 0.83+/-0.03 eV and an attempt frequency of 10(10.3+/-0.4) s(-1). (C) 1999 American Institute of Physics. [S0021-9606(99)71010-X].
引用
收藏
页码:5351 / 5354
页数:4
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