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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 14.11: Poster

Montag, 8. März 2004, 18:00–21:00, Bereich C

Adsorption and decompostion of prenal on Pt(111) — •Jan Haubrich, Alexander Krupski, Conrad Becker, and Klaus Wandelt — Institut für Physikalische und Theoretische Chemie, Wegelerstrasse 12, D-53115 Bonn, Germany

The adsorption of prenal on Pt(111) is investigated with HREELS, TPD and LEED. After adsorption of prenal on Pt(111) at 100K the desorption of fragments between 1 and 100 amu has been studied with TPD for series of a increasing exposures. Only signals of the masses 2, 28 and 84 (prenal) have been detected. The TPD results indicate that molecular prenal desorbs from a monolayer, a 2nd adsorption state and multilayer at 199K, 177K and 160 K, respectively. For the mass 28, a signal is observed around 420K, saturating below the monolayer exposure and pointing towards the decarbonylation of an irreversibly adsorbed submonolayer species. Several signals are detected for molecular hydrogen desorption between 285K and 480K. HREELS experiments carried out between 100K and 500K show only small shifts for the reversibly adsorbed species, while the species remainig above 199K shows some shifts and sizeable changes in scattering intensities. Above 420K only traces of hydrocarbon species can be observed by HREELS.