The structure of oxygen on Cu(100) at low and high coverages

Citation
M. Kittel et al., The structure of oxygen on Cu(100) at low and high coverages, SURF SCI, 470(3), 2001, pp. 311-324
Citations number
37
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
00396028 → ACNP
Volume
470
Issue
3
Year of publication
2001
Pages
311 - 324
Database
ISI
SICI code
0039-6028(20010101)470:3<311:TSOOOC>2.0.ZU;2-0
Abstract
The local adsorption structure of oxygen on Cu(1 0 0) has been studied usin g O Is scanned-energy mode photoelectron diffraction. A detailed quantitati ve determination of the structure of the 0.5 ML (root2 x 2 root2)R45 degree s -O ordered phase confirms the missing-row character of this reconstructio n and agrees well with earlier structural determinations of this phase by o ther methods, the adsorbed O atoms lying only approximately 0.1 Angstrom ab ove the outermost Cu layer. At much lower coverages, the results indicate t hat the O atoms adopt unreconstructed hollow sites at a significantly large r O-Cu layer spacing, but with some form of local disorder. The best fit to these data is achieved with a two-site model involving O atoms at Cu-O lay er spacings of 0.41 and 0.70 Angstrom in hollow sites: these two sites (als o implied by an earlier electron-energy-loss study) are proposed to be asso ciated with edge and centre positions in very small c(2 x 2) domains as see n in a recent scanning tunnelling microscopy investigation. (C) 2001 Elsevi er Science B.V. All rights reserved.