Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 24: Postersitzung (Epitaxie und Wachstum, Oxide und Isolatoren, Elektronische Struktur, Oberfl
ächenreaktionen, Adsorption an Oberfl
ächen, Organische Dünnschichten)
O 24.60: Poster
Mittwoch, 26. März 2003, 14:30–17:30, P1
Interaction of Na with Molecular Surfaces (H2O; CH3OH) between 80 and 130K — •O. Höfft1, A. Borodin1, U. Kahnert1, S. Krischok2, and V. Kempter1 — 1Institut für Physik und Physikalische Technologien, Technische Universität Clausthal, Leibnizstr. 4 38678 Clausthal Zellerfeld — 2Institut für Physik der TU Ilmenau, P. O. Box 100565, 98648 Ilmenau
Films of H2O and CH3OH were grown under the control of MIES, UPS, and LEED. They were exposed to Na atoms at T=80K and analyzed by Metastable Impact Electron Spectroscopy (MIES) and UPS(HeI). On both surfaces the formation of Na+ takes place whereby the 3s electron is transferred to the solvent H2O or CH3OH. According to MIES the solvated electrons produce a spectral feature at a binding energy which is about 1eV larger than for Na in a metallic environment. The solvated electrons play an important role in the processes initiated by the Na adsorbate. The detection of the reaction products is made after thermal desorption of the solvent molecules (which takes place around 150K). For H2O the formation of Na+OH− takes place; for CH3OH the electron spectra are compatible with the formation of Na+CH3O−. Models will be discussed that can explain the observed proton transfer processes.