Photoemission Study of Co Adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures |
| P.J. Godowski W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wrocław, Poland J. Onsgaard Institute of Physics, Odense University, Campusvej 55, 5230 Odense M, Denmark S.V. Christensen Institute for Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark and J. Nerlov Department of Chemistry, University of Copenhagen, Universitetparken 5, 2100 Copenhagen, Denmark |
| Received: September 25, 1995; in final form: November 29, 1995 |
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| Improved adsorption characteristics of a K predosed Cu(110) surface with a coverage corresponding to a point before the work function minimum have been confirmed. Analysis of the CO-induced orbitals in the photoelectron spectra of the CO/K/Cu(110) interface for low coverages of carbon monoxide adsorbed at 118 K has been done. Noticeable changes of the parameters of the orbitals with increasing CO coverage have been registered. Elongation of the C-O bond without dissociation of the molecule has been deduced from the energetic separation of 3.4 eV between the 4σ and the 1π orbital. A weakening of the CO-interface bond with coverage has been found on the base of decreasing 5σ-1π separation with increasing 4σ/5σ intensity ratio. Perpendicular orientation of CO molecules to the plane of the substrate surface has been concluded from analysis of the constant initial state spectra of the 4σ and 5σ/1π orbitals. |
| DOI: 10.12693/APhysPolA.89.657 PACS numbers: 79.60.Jv, 33.60.-q, 82.80.Pv |