Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.77: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Thermally and Electron–Induced Processes in Condensed Acetic Acid–Water Films between 80 and 200K studied with MIES, UPS(HeI and II), FTIR and TPD — •S. Bahr1, O. Höfft1, A. Borodin1, V. Kempter1, F. Borget2, T. Chiavassa2, and A. Allouche2 — 1Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, D-38678 Clausthal-Zellerfeld — 2Physique des Interactions Ioniques et Moléculaires, CNRS-UMR6633 Campus Universitaire de Saint Jérôme, Marseille, France
Thermally and electron–induced processes in condensed acetic acid (AA)-water films, deposited on tungsten and gold at 80K and 120K, were studied with Metastable Impact Electron Spectroscopy (MIES), UPS(HeI and II), FTIR-Spectroscopy and TPD in a temperature range between 80K (120K) and 200K. The results are interpreted with the help of cluster DFT calculations. The prepared interfaces, namely AA layers on thin films of solid water and H2O adlayers on thin AA films, were characterised with the above mentioned techniques at 80K (120K) and addionally with TPD during annealing. By the combination of electron spectroscopy with FTIR and TPD we are able to get informations about inter and intra species binding strengths in addition to structural changes (in the case of AA from cyclic dimers to chain like structures at 150K) and desorption behaviour of both species in the films during annealing. Currently, we study the electron–induced modification of the AA film structure as well as processes initiated by the radiation–induced H2O fragments (OH, H3O+ etc).