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O: Fachverband Oberflächenphysik

O 22: Organic-Inorganic Hybrid Systems and Organic Films

O 22.3: Poster

Monday, March 7, 2016, 18:15–20:30, Poster E

Studying the F4TCNQ/Au(111) Interface with Two-Photon Photoemission — •Sascha Feldmann, David Gerbert, and Petra Tegeder — Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Deutschland,

In our ongoing efforts pointing towards a deeper understanding of the electronic properties at metal/organic interfaces a convenient approach could be the characterization of well-studied organic molecules adsorbed on single crystal noble metal surfaces. Tetrafluorotetracyanoquinodimethane (F4TCNQ) adsorbed on Au(111) was chosen as a prototypical system to investigate a negatively charged organic acceptor molecule on a noble metal surface by means of two-photon photoemission (2PPE). 2PPE enables the observation of occupied and unoccupied electronic states as well as the study of photo-induced processes via photo-induced changes in the electronic structure. Varying photon energies, angle of incidence or time delay between two laser pulses further information about dispersion and lifetime of electronic states can be obtained, resulting in a detailed picture of the electronic properties of the F4TCNQ/Au(111) interface.