Abstract:
C K-edge near edge X-ray absorption fine structure (NEXAFS) measurements have been used to investigate CO adsorption at 130 K on ZnO(000 (1) over bar)-O and on the same surface after a 2D submonolayer Cu film has been deposited. CO adsorption on clean ZnO(000 (1) over bar)-O gives rise to two pi* resonances in the NEXAFS spectra at 287.7 +/- 0.2 eV and 290.4 +/- 0.2 eV. These are assigned to molecular CO, which is metastable under our experimental conditions, and CO32-. Only one intense pi* resonance, at 287.7 +/- 0.2 eV, is observed for CO adsorption on ZnO(000 (1) over bar)-O after submonolayer Cu deposition. This is also attributed to adsorbed molecular CO. The polarisation dependence of this resonance indicates that the CO molecular axis is tilted by 17 +/- 10 degrees away from the surface normal. © 1999 Elsevier Science B.V. All rights reserved.

Addresses:
Thornton G, Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England.
Univ Manchester, Interdisciplinary Res Ctr Surface Sci, Manchester M13 9PL, Lancs, England.
Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England.
Univ Washington, Dept Chem, Seattle, WA 98195 USA.

Publisher:
ELSEVIER SCIENCE BV, AMSTERDAM

IDS Number:
238PJ

ISSN:
0039-6028