Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Metal substrates: Adsorption of organic / bio molecules IV
O 37.5: Vortrag
Dienstag, 23. März 2010, 16:00–16:15, H36
The orbital structure of π-conjugated organic molecules on metal surfaces probed by angle-resolved photoemission — Johannes Ziroff1, •Michael Wiessner1, Frank Forster1, Peter Puschnig2, Achim Schöll1, and Friedrich Reinert1,3 — 1Universität Würzburg, Experimentelle Physik VII, D-97074 Würzburg — 2University of Leoben, Chair of Atomistic Modelling and Design of Materials, A-8700 Leoben — 3FZ Karlsruhe, Gemeinschaftslabor für Nanoanalytik, D-76021 Karlsruhe
We present angle resolved photoemission spectra of monolayers of π-conjugated molecules adsorbed on single-crystalline metal surfaces. Comparing the experimental k-dependant intensity distribution of the molecular states to DFT calculations for the free molecule allows to detect sophisticated modifications of the molecular orbitals at the interface.
In case of the single-domain system PTCDA on Ag(110) the 2D emission pattern confirms that the now occupied interface state is mainly derived from the former LUMO-orbital. Moreover, a clear contribution of metal states is evident from additional intensity in normal emission. In the contrary, the structure of the molecular HOMO changes only slightly upon chemisorption on Ag surfaces. Additional data on other planar π-conjugated organic molecules such as coronene or NTCDA demonstrates the potential of this approach in analysing the interaction at metal-organic interfaces in great detail.