Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 82: Nanostructure at Surfaces: Dots and Clusters
O 82.7: Vortrag
Donnerstag, 19. März 2015, 12:00–12:15, MA 043
Photoelectron spectroscopy of nearly free C60 fullerenes on noble gas layers (Ar/Kr/Xe): Dependence of the HOMO peak position on the noble gas electron affinity — •Dominik Wolter, Christoph Schröder, and Heinz Hövel — Fakultät Physik / DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
We have investigated C60 deposited on argon (Ar), krypton (Kr) and xenon (Xe) layers, with ultraviolet photoelectron spectroscopy (UPS). The noble gas layers are intended to decouple the C60 fullerenes from the underlying substrate. As substrates we used copper(111), silver(111) and gold(111) single crystals covered with 60 monolayers (ML) of Xe and optional additional 10 ML of Kr or Ar on top of the Xe films. The first ML of each gas was adsorbed at slightly higher temperatures than the following ones to get a well ordered surface. To extract the signal of nearly free fullerenes we measured the spectra for the noble gas covered substrate before C60 deposition and subtracted them from measurements after the C60 deposition. Compared to the expected position we were able to observe a shift of the C60 signal, which is identical to the electron affinity of the noble gas layers. This is of importance for the interpretation of UPS on mass selected metal clusters on similar surfaces.