Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 31: Organische Dünnschichten III

O 31.1: Vortrag

Montag, 7. März 2005, 10:45–11:00, TU EB420

Structural investigation of organic monolayers on Ag(111) using NIXSW — •C. Stadler, A. Schöll, S. Hansen, C. Kumpf, and E. Umbach — Exp. Physik II, Uni Würzburg, Germany

The investigation of the interaction of organic molecules with inorganic substrates is a key issue for the understanding of interface effects. We report on new NIXSW measurements on different organic monolayers with flat lying molecules on Ag(111). Information about the bonding distance of different atomic species in the molecule is obtained. In the case of the relaxed monolayer structure of NTCDA a value of 3.02 Å  and 3.08 Å  for O and C respectively, was measured, demonstrating that the molecule is truely chemisorbed on the surface, not only weakly physisorbed. For the oxygen atoms we also tried to resolve possible differences in the bonding strength for the two different oxygen species in the molecule by identifying core level shifts in the photoemission signal. Measurements on metallo-phthalocyanines have also been performed in order to study the position of the metallic atom with respect to the molecular plane and the substrate. Non-dipolar contributions to the photoemission yield are taken into account as well as electron induced effects on the Auger yield.