Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 47: Organic films IV
O 47.2: Vortrag
Freitag, 31. März 2006, 11:30–11:45, PHY C213
LEED-IV for the structural investigation of the EC4T monolayer on Ag(111) — •Johannes Ziroff1, Christian Kumpf1, Azzedine Bendounan1, Wolfgang Moritz2, and Friedrich Reinert1 — 1Experimentelle Physik II, Physikalisches Institut, Univ. Würzburg — 2Sektion Kristallographie, Department für Geo- und Umweltwissenschaften, LMU München
The Low Energy Electron Diffraction-IV (LEED-IV) technique is a powerful tool for obtaining structural information on surfaces and is often used for the investigation of adsorbate systems or surface reconstructions. In the past this technique was frequently applied to inorganic systems. For organic adsorbates there is a severe demand for detailed structural information e.g., exact atomic coordinates. The unit cells of organic adsorbates are often very large and beam damage effects play an essential role. However, in some cases LEED-IV can be used to investigate organic adsorbate systems.
We report on a LEED-IV study of a well ordered monolayer of EC4T on Ag(111), the so called relaxed monolayer structure. Important geometric parameters like the position of the molecule (height above the surface and adsorption site) as well as possible bending and deformation of the molecule down to the variation of single atomic positions were investigated. The data are compared with results from other experimental methods (e.g., NIXSW, SXRD, NEXAFS), and the effect of radiation damage will be addressed. A structural model for EC4T on Ag(111) is presented.