Surface diffusion of CO molecules on Pd{111} studied with photoelectron emission microscopy

被引：20

作者：

Snabl, M

Borusik, O

Chab, V

Ondrejcek, M

Stenzel, W

Conrad, H

Bradshaw, AM

机构：

[1] MAX PLANCK GESELL, FRITZ HABER INST, D-14195 BERLIN, GERMANY

[2] ACAD SCI CZECH REPUBL, INST PHYS, CR-16200 PRAGUE 6, CZECH REPUBLIC

来源：

SURFACE SCIENCE | 1997年 / 385卷 / 2-3期

关键词：

carbon monoxide; electron microscopy; low index single crystal surfaces; palladium; surface diffusion;

D O I：

10.1016/S0039-6028(97)00435-4

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 diffusion of CO on Pd{111} has been studied with photoelectron emission microscopy by monitoring the time evolution of CO concentration along flat, quasi-one-dimensional terraces of the surface. From the analysis of the concentration profiles the activation energy and the pre-factor for the diffusion coefficient are determined to be E-a=175(+/-12)meV and D-0=2.2 x 10(-3) cm(2) s(-1) respectively. Previous, ''macroscopic'' measurements of CO diffusion on metals have probably resulted in too high values for E-a due to the neglect of the effects of the surface microtopography. (C) 1997 Elsevier Science B.V.

引用

页码：L1016 / L1022

页数：7

共 19 条

[1] NMR-STUDY OF DIFFUSION OF CO ON ALUMINA-SUPPORTED PT CLUSTERS [J].