SURFACE-DIFFUSION OF CO MOLECULES ON PD(111) STUDIED WITH PHOTOELECTRON EMISSION MICROSCOPY

Authors
SNABL M BORUSIK O CHAB V ONDREJCEK M STENZEL W CONRAD H BRADSHAW AM
Citation
M. Snabl et al., SURFACE-DIFFUSION OF CO MOLECULES ON PD(111) STUDIED WITH PHOTOELECTRON EMISSION MICROSCOPY, Surface science, 385(2-3), 1997, pp. 1016-1022
Citations number
19
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
385
Issue
2-3
Year of publication
1997
Pages
1016 - 1022
Database
ISI
SICI code
0039-6028(1997)385:2-3<1016:SOCMOP>2.0.ZU;2-D
Abstract
The diffusion of CO on Pd{111} has been studied with photoelectron emi ssion microscopy by monitoring the time evolution of CO concentration along flat, quasi-one-dimensional terraces of the surface. From the an alysis 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, ''macr oscopic'' measurements of CO diffusion on metals have probably resulte d in too high values for E-a due to the neglect of the effects of the surface microtopography. (C) 1997 Elsevier Science B.V.