1. Hexa-peri-hexabenzocoronene on Ag(111): Monolayer/Multilayer Transition of Molecular Orientation and Electronic Structure
- Author
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Dietrich R. T. Zahn, Jürgen P. Rabe, Joachim Räder, Stephan Seifert, G. N. Gavrila, Klaus Müllen, Robert L. Johnson, Norbert Koch, and Hendrik Glowatzki
- Subjects
Chemistry ,Binding energy ,Intermolecular force ,Electronic structure ,Substrate (electronics) ,XANES ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Crystallography ,General Energy ,Monolayer ,Physical and Theoretical Chemistry ,Spectroscopy ,Ultraviolet photoelectron spectroscopy - Abstract
The molecular orientation and electronic structure of hexa-peri-hexabenzocoronene (HBC) deposited on Ag(111) was investigated in the mono- and multilayer regime by near edge X-ray absorption fine structure spectroscopy (NEXAFS), scanning tunneling and scanning force microscopy (STM and SFM), and ultraviolet photoelectron spectroscopy (UPS). We found that the molecular orientation changed as a function of coverage, exhibiting a transition from flat lying HBC in the monolayer to molecules being 43° inclined relative to the substrate plane in the multilayer. This structural transition was accompanied by a rigid shift of molecular energy levels by 0.3 eV toward higher binding energy between mono- and multilayer. In addition, broadening of the highest molecular levels by ca. 0.35 eV was observed in the multilayer, suggesting the formation of extended intermolecular energy bands.
- Published
- 2008
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