Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 4: Electronic Structure of Surfaces I
O 4.5: Talk
Monday, March 16, 2015, 11:30–11:45, MA 041
High Resolution Electron Energy Loss Study of Pd and Pt Phthalocyanine on Ag(111) — •Jessica Sforzini, Francois Bocquet, and Stefan Tautz — Peter Gruenberg Institute 3, Forschungszentrum Juelich, 52428 Juelich, Germany
We have investigated the geometrical and the vibrational properties of Pd and Pt Phthalocyanine on Ag(111) by Low Energy Electron Diffraction (LEED) and by High Resolution Electron Energy Loss Spectroscopy (HREELS). The LEED patterns show that the molecules grow highly ordered on the surface. The HREELS spectrum is dominated by vibrational modes with symmetry A2u that produce an out-of-plane variation in the dipole moment. This indicates a flat adsorption geometry. The asymmetric vibrational losses, between 1000 and 1500 cm−1, indicate the presence of an interfacial dynamical charge transfer that is more pronounced in the case of Pd molecules. We also studied both systems after exposure to molecular hydrogen, but observe no drastical changes in the behavior with the central metal type.