Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 44: Poster Session II (Semiconductors; Oxides and Insulators: Adsorption, Clean Surfaces, Epitaxy and Growth; Surface Chemical Reactions and Heterogeneous Catalysis; Surface or Interface Magnetism; Solid-Liquid Interfaces; Organic, Polymeric, Biomolecular Films; Particles and Clusters; Methods: Atomic and Electronic Structure; Time-resolved Spectroscopies)

O 44.11: Poster

Mittwoch, 28. März 2007, 17:00–19:30, Poster C

Charge transfer dynamics in self-assembled monolayers — •Stefan Neppl¹, Ulrich Bauer¹, Peter Feulner¹, Andrey Shaporenko², Michael Zharnikov², and Dave Allara³ — ¹Physikdepartment E20, TU-München, Germany — ²Angewandte Physikalische Chemie, Universität Heidelberg, Germany — ³Chemistry and Materials Science, Pennsylvania State University, USA

Charge transfer dynamics is a key quantity for the use of self-assembled monolayer as functional interfaces. Utilizing the core hole clock method, we study the endgroup to substrate electron transfer dynamics for cyanide terminated aliphatic thiolates on Au substrates. For aliphatic backbones consisting of 16 methylene groups, we observe pure autoionization spectra for pi-resonant N1s and C1s excitation of the CN endgroup. For resonant CN excitation of short chains of only 2 methylene groups, a mixture of resonant and non-resonant decay indicates endgroup to substrate charge transfer during the lifetime of the core holes. Quantitative results are obtained from the ratios of these contributions. Supported by the DFG (Fe 346/1-3) and the BMBF (05 KS4VHA/4 and 05 ES3XBA/5).