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Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 83: Surface Chemistry and Growth

O 83.1: Talk

Thursday, March 19, 2015, 10:30–10:45, MA 144

Temperature-dependent Reactions of Phthalic Acid on Ag(100) — •Matthias Franke1, Florencia Marchini2, Quratulain Tariq1, Michael Röckert1, Federico José Williams2, and Hans-Peter Steinrück11Universität Erlangen-Nürnberg — 2Universidad de Buenos Aires

Small aromatic molecules on single crystal surfaces are particularly interesting, since they may be used not only as model systems, but also as precursors for the formation of larger organic molecules, e.g. polymers.

We applied high resolution X-ray photoelectron spectroscopy (XPS) using synchrotron radiation and temperature programmed desorption (TPD) to study the temperature-dependent reactions of phthalic acid on Ag(100). After deposition at 110 K, the species adsorbed on the surface can be identified as phthalic acid. Upon heating, both monomeric and polymeric anhydride species are formed. This is accompanied by a change in molecular orientation, as observed by near edge X-ray absorption fine structure (NEXAFS) measurements. The monomer, phthalic anhydride, desorbs at 300 K, whereas the polymeric species remains on the surface until it decomposes above 400 K into phthalic anhydride, water, CO2 and benzene.

The project is supported by the DFG through FOR 1878 (funCOS).

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