Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.7: Poster

Tuesday, April 1, 2014, 18:30–22:00, P1

Vibrational properties and dynamic charge transfer of the CuPc/Ag(111)-system — •Sebastian Thussing und Peter Jakob — Fachbereich Physik, Philipps-Universität Marburg, 35032 Marburg, Germany

The vibrational properties and thermal evolution of ultra thin films of copper-pthalocyanine (CuPc) grown on Ag(111) have been investigated using Fourier-transform infrared absorption spectroscopy (FTIRAS), spot-profile-analysis low energy electron diffraction (SPA-LEED) and thermal desorption spectroscopy (TDS). Thereby, various phases in the submonolayer regime could be distinguished and characterized. Bilayer and multilayer are largely decoupled from the Ag(111) substrate and display a distinctly different spectroscopic signature. Mono- and bilayers are orientated parallel to the Ag(111) surface whereas a slightly inclined geometry prevails for the multilayers. The monolayer phases are subject to a pronounced interfacial dynamical charge transfer (IDCT). Interestingly, this process is attenuated upon growth of the bilayer. TDS spectra reveal an incomplete desorption for the CuPc monolayer from the Ag(111) surface. At about 600K a second pathway becomes dominant with fragments desorbing in variable amounts.