STRUCTURE OF DISORDERED ETHYLENE ADSORBED ON PT(111) ANALYZED BY DIFFUSE LEED - ASYMMETRICAL DI-SIGMA BONDING FAVORED

Authors
DOLL R GERKEN CA VANHOVE MA SOMORJAI GA
Citation
R. Doll et al., STRUCTURE OF DISORDERED ETHYLENE ADSORBED ON PT(111) ANALYZED BY DIFFUSE LEED - ASYMMETRICAL DI-SIGMA BONDING FAVORED, Surface science, 374(1-3), 1997, pp. 151-161
Citations number
75
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
374
Issue
1-3
Year of publication
1997
Pages
151 - 161
Database
ISI
SICI code
0039-6028(1997)374:1-3<151:SODEAO>2.0.ZU;2-L
Abstract
The adsorption structure of ethylene on Pt(111) at 200 K is studied by means of diffuse low-energy electron diffraction (DLEED), analyzing d iffuse intensity versus energy, DI(E), curves. The data favor a mixed occupation of two similar sites with the centers of the C-C bonds abov e both fee and hcp sites and very similar local structures. In each ca se, the best-fit adsorption geometry is asymmetrical between the two c arbon atoms, the molecular axes likely being tilted with respect to th e surface plane by about 22 degrees. Substrate relaxation is undetecta ble.