Regensburg 2004 – wissenschaftliches Programm
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O: Oberflächenphysik
O 28: Postersitzung (Elektronische Struktur, Grenzfläche fest-flüssig, Halbleiteroberflächen und -grenzflächen, Magnetismus und Symposium SYXM, Methodisches, Nanostrukturen, Oberflächenreaktionen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie)
O 28.57: Poster
Mittwoch, 10. März 2004, 16:00–19:00, Bereich C
Electron Solvation during the Interaction of Na Atoms with Polar Molecules — •A. Borodin1, O. Höfft1, U. Kahnert1, V. Kempter1, Y. Ferro2, 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
The interaction of Na atoms with molecular films (H2O; CH3OH; NH3) was studied with metastable impact electron spectroscopy (MIES) under UHV conditions. The films were grown at 90K, and exposed to Na. The spectral feature from 3sNa ionization occurs at an energetic position different from that found for metals or semiconductors. The results are compared with DFT calculations. Experiment and theory agree in the energetic positions of the main spectral features from the molecular and sodium ionization. The calculations suggest that the 3sNa emission observed experimentally originates from solvated 3s electrons which are located far from the Na–core and become stabilized by solvent molecules. The simultaneous emergence of emission from OH (or CH3O) and from solvated 3s electrons suggests that the delocalization and, consequently, the solvation play an important role in the Na–induced formation of CH3O and OH species from methanol and water, respectively.