Abstract
Copper phthalocyanines (CuPc) on a Ag(110) surface have been studied by ultravioletphotoemission spectroscopy (UPS). On depositing CuPc organic films, the features fromthe substrate 3d valence fade and four new features corresponding to the adsorbedmolecules emerge at 1.68, 4.45, 6.36 and 9.20 eV below the Fermi level. Thesefeatures shift in binding energy with increasing thickness of the organic films.In the case of a monolayer, angle-resolved UPS measurements suggest that themolecular plane is nearly parallel to the substrate. Further theoretical calculationindicates that the adsorption of CuPc on a hollow site is the most favourableconfiguration, and the separation between the adsorbate and the substrate is about2.7 Å.
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