Regensburg 2004 – scientific programme
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O: Oberflächenphysik
O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)
O 14.56: Poster
Monday, March 8, 2004, 18:00–21:00, Bereich C
The Interaction of Benzene Derivatives with Amorphous Solid Water — •O. Höfft1, A. Borodin1, U. Kahnert1, M. O. Abou-Helal1, S. Krischok2, and V. Kempter1 — 1Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstr. 4, D–38678 Clausthal–Zellerfeld — 2Institut für Physik und Zentrum für Mikro– und Nanotechnologien der TU Ilmenau, P.O. Box 100565, D–98684 Ilmenau
Interfaces between films of benzene derivatives (C6H6; C6H5Cl; ortho–C6H4OHCl; C5H5N) and solid H2O were studied between 90 and 200K with metastable impact electron spectroscopy (MIES) and ultraviolet photoelectron spectroscopy (UPS(HeI and II)): (i) adsorption of the benzene derivatives on solid water in order to simulate their interaction with ice particles, and (ii) deposition of water on the organic films in order to simulate the process of water precipitation. The different behaviour found for the four studied cases is traced back to the different mobilities of the molecules with respect to that of water. The interaction between H2O and the benzene dervatives at the interfaces is discussed on the basis of qualitative profiles for the free energy for the systems.