PHOTOEMISSION-STUDY OF CO ADSORBED ON K CU(110) - ANALYSIS OF ADSORBATE-INDUCED STRUCTURES/

Improved adsorption characteristics of a K predosed Cu(110) surface wi th a coverage corresponding to a point before the work function minimu m have been confirmed. Analysis of the CO-induced orbitals in the phot oelectron spectra of the CO/K/Cu(110) interface for low coverages of c arbon monoxide adsorbed at 118 It 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 mol ecule has been deduced from the energetic separation of 3.4 eV between the 4 sigma and the 1 pi orbital. A weakening of the CO-interface bon d with coverage has been found on the base of decreasing 5 sigma-1 pi separation with increasing 4 sigma/5 sigma intensity ratio. Perpendicu lar orientation of CO molecules to the plane of the substrate surface has been concluded from analysis of the constant initial state spectra of the 4 sigma and 5 sigma/1 pi orbitals.