D. Schondelmaier, S. Cramm, R. Klingeler, C. Zilkens, and W. Eberhardt

In the last annual report we gave details about investigations of new hydrophobic materials suited for the application as self-cleaning surfaces by use of the Lotus effect. Due to its characteristics like self orientation and formation of monolayers on several substrates, these Fluoroalkyl Silanes (PAS) proved to be an interesting representative for an industrial application. This year, one emphasis of our researches was the orientation of FAS again. We compared computer simulated and experimental measured XANES spectra. Additional XANES measurements of molecules with various chain length are given. Another property of such FAS was found. It concerns a partial desorption of the molecules by UV irradiation. This phenomenon also called 'cracking' opens a multiplicity of new applications.