Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Poster: Ultrafast Electron and Spin Dynamics at Interfaces
O 79.1: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Charge transfer dynamics in monomolecular films: azulene and polyacene backbones, pyridine as a resonantly addressable group — Tobias Wächter1, Andreas Terfort2, Mikhail V. Barybin3, and •Michael Zharnikov1 — 1Applied Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany — 2Institut für Anorganische und Analytische Chemie, Universität Frankfurt, 60438 Frankfurt, Germany — 3Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, USA
We review recent progress in the application of core hole clock approach in the framework of resonant Auger electron spectroscopy to the monomolecular assembles to study electron transfer (ET) dynamics in these systems serving as prototypes of molecular electronics devices. The ET pathway to the substrate was unambiguously defined by resonant excitation of the specific tail group (nitrile) attached to the molecular backbone. Characteristic ET times within the femtosecond domain were determined, along with the attenuation factors for the ET dynamics, analogous to the case of the static transport. Three different systems were studied. The first system was 2-mercapto-6-cyanoazulene monolayer which is of importance in view of a possible correlation between the ET dynamics and molecular dipole moment. The second systems were monolayers with the acene backbone which are of importance in view of the existing controversy regarding the attenuation factor for this specific type of molecular films. The third system was a series of pyridine-substituted monolayers where, instead of nitrile, the pyridine moiety was used as the starting point for ET to the substrate.