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O: Oberflächenphysik

O 46: Adsorption an Oberfl
ächen V

O 46.6: Vortrag

Dienstag, 8. März 2005, 17:00–17:15, TU EB420

Photodesorption of molecules adsorbed on ultrathin Au — •Claudia Wesenberg and Eckart Hasselbrink — FB Chemie, Universitaet Duisburg-Essen, Universitaetstr. 5, 45117 Essen, Germany

Ultrathin Au films (20-100ML) deposited on Si(100) are suited to study the electron dynamics in such films and the influence of the film thickness on charge transfer to the adsorbate and subsequent photodesorption. In our experiments, NO is chosen as the probe molecule. Its adsorbtion is performed at 100K on the Au-covered Si(100) surface. Photodesorption is induced using a Nd:YAG laser and the desorbed molecules are detected by QMS. The film thickness is varied in order to obtain information about the charge transfer dynamics between the ultrathin Au film and the NO adsorbate. The photodesorption crosssection of NO is expected to decrease with increasing film thickness.