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O: Oberflächenphysik
O 42: Oberfl
ächenreaktionen II
O 42.2: Vortrag
Dienstag, 8. März 2005, 11:00–11:15, TU EB407
Reversible isomerization of an individual photochrome molecule by tunneling electrons — •Jörg Henzl1, Karina Morgenstern2, Heiko Gawronski1, Michael Mehlhorn1, and Karl-Heinz Rieder1 — 1Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin — 2Universität Hannover, Institut für Festkörperphysik, Appelstr. 2, 30167 Hannover
Azobenzene molecules are well known for the light-stimulated cis-trans isomerization. We have investigated Disperse Orange 3 on the Au(111) surface at 5K under UHV conditions with a scanning tunneling microscope. Disperse Orange 3 (C12H10N4O2) is an azobenzene derivate (C6H4N=NC6H4) with a NO2 and a NH2 endgroup. At a deposition temperature of about 230K the molecules form dimers, which can be separated into monomers. We induce isomerization of individual molecules between the cis- and trans-state for several times both within dimers and monomers by tunneling electrons. Detailed insights in the switching process will be presented in this talk.