Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5396535 | Journal of Electron Spectroscopy and Related Phenomena | 2010 | 7 Pages |
Abstract
The adsorption of carbon monoxide on the potassium modified Cu(1Â 1Â 5) surface was investigated using photoelectron spectroscopy based on synchrotron radiation. From detailed analysis of the 1s core levels in combination with existing knowledge, the assignment of surface species is performed. It is demonstrated that in dependence of the alkali coverage, several adsorption states of CO are present on the interface at 135Â K. From the temperature dependence of the C 1s and O 1s profiles it is established that surface reactions based on CO dissociation start from 223Â K over an interface with a potassium coverage close to half a complete K overlayer. The role of potassium as a reordering environment of adsorbed CO, leading to molecule dissociation and disproportionation is proposed. It is observed that a higher density of potassium on the substrate surface blocks adsorption sites for incoming CO molecules and no dissociation takes place.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
P.J. Godowski, S.V. Hoffmann, J. Onsgaard,