Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.17: Poster
Thursday, February 28, 2008, 17:00–19:30, Poster A
Light-induced modifications of the molecular switch 3-(4-(4-Hexylphenylazo)phenoxy)propan-1-thiol adsorbed on Au(111) studied by two photon photoemission — •Nils Heinemann1, Oleksiy Andreyev1, Ulrich Jung1, Claudia Bornholdt2, Olaf Magnussen1, Rainer Herges2, and Michael Bauer1 — 1Institut für Experimentelle und Angewandte Physik, Uni Kiel — 2Otto-Diehls Institut für Organische Chemie, Uni Kiel
Molecular switches and their intriguing properties attract much interest in the field of molecular electronics. Whereas the reversible switching of molecules has been well studied in gases and liquids, the successful realization and sensing of molecular switching at surfaces still remains a challenging task. Quite recently, Hagen et al. reported on the observation of a photoinduced reversible switching of tetra-tert-butyl-azobenzene molecules adsorbed on a Au(111) surface by means of the two photon photoemission technique (2PPE) [1].
In this contribution we will present 2PPE results of the molecular switch 3-(4-(4-Hexylphenylazo)phenoxy)propan-1-thiol adsorbed on Au(111). A tuneable 80 MHz fs-laser system is employed to study changes in the electronic structure of the adsorbed molecule induced by laser illumination at 365 nm and 435 nm. We observe a distinct and wavelength characteristic impact on the 2PPE spectra, which also depends critically on the applied light intensity. The results will be discussed particularly in the context of a switching of the adsorbed molecule.
[1] S. Hagen et al., Chem. Phys. Lett. 444 (2007) 85-90.