Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 88: Metal substrates: Adsorption of organic / bio molecules IX

O 88.6: Vortrag

Donnerstag, 17. März 2011, 18:30–18:45, PHY C213

Growth and thermal evolution of ultrathin NTCDA films on Ag(111) studied by FT-IRAS and TPD — •Carolin R. Braatz, Gregor Öhl, and Peter Jakob — Philipps-Universität Marburg

The growth and thermal evolution of ultrathin films of 1,4,5,8-naphthalene-tetracarboxylic dianhydride (NTCDA) adsorbed on Ag(111) was investigated by Fourier-transform infrared absorption spectroscopy (FT-IRAS) and thermal desorption. The films were grown by organic molecular beam deposition in an UHV environment and analyzed in situ. Results will be presented for coverages from the sub-monolayer to the lower multilayer regime and in a wide temperature range (20 - 500 K). Depending on growth conditions and annealing temperatures a variety of different phases could be identified from their characteristic vibrational signatures, allowing us to track related phase transformations in detail. Thereby, a parallel oriented metastable phase is observed prior to (crystalline) multilayer formation.