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O: Fachverband Oberflächenphysik

O 37: Metal substrates: Adsorption of organic / bio molecules IV

O 37.2: Vortrag

Dienstag, 23. März 2010, 15:15–15:30, H36

A FT-IRAS study on the adsorption and growth of ultrathin films of PTCDA on Au(111) and Ag(111) surfaces — •Gregor Öhl, Carolin R. Braatz, and Peter Jakob — Surface Spectroscopy Group, Philipps-University, Marburg, Germany

The vibrational properties of ultrathin films of 3,4,9,10 perylene tetracarboxylic dianhydride (PTCDA) adsorbed on Au(111) and Ag(111) as investigated by means of Fourier-transform infrared absorption spectroscopy (FT-IRAS) will be presented. The films were grown by organic molecular beam deposition (OMBD) in an UHV environment and analyzed in situ. Our excellent spectral resolution accompanied by a formidable sensitivity allows us to clearly distinguish the various phases encountered during the growth and follow the thermal evolution of the layers from cryogenic up to elevated temperatures. Results will be presented for coverages from the sub-monolayer to the lower multilayer regime. Furthermore, the effects of preadsorbed spacer layers of rare gases will be discussed.