Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.6: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Electronic and adsorption properties of perylene-tetracarboxylic-dianhydride on Au(111) — •Stephan Stremlau1 and Petra Tegeder1,2 — 1Freie Universität Berlin, Institut für Experimentalphysik — 2Rubrecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut
Electronic and vibrational high resolution electron energy loss spectroscopy as well as temperature programmed desorption spectroscopy have been employed to gain insights into the adsorption behavior and the electronic properties of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on Au(111). In the sub-monolayer regime the molecules adsorb in a planar geometry. With increasing coverage the molecules adopt a tilted configuration. Using sufficient high excitation energies of around 15.5 eV, the loss spectra in the multilayer regime show two strong electronic transitions at 2.3 and 2.5 eV. In the sub-monolayer regime only one transition at 2.6 eV is observed. The binding energy in the sub-monolayer range is 1.7(0.2) eV which is significantly lower than the recently published value of 2.5 eV [1].
[1] C. Wagner, N. Fournier, F.S. Tautz, R. Temirov, Phys. Rev. Lett., 109, 2012, 076102.