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O: Fachverband Oberflächenphysik

O 91: [MA] Poster II

O 91.40: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Electron Localization in a Charge Transfer Salt on Au(111) — Tobias R. Umbach¹, Isabel Fernandez-Torrente¹, •Michael H. Kleinert¹, Ricardo Rurali², Mats Persson³, Jose I. Pascual¹, and Katharina J. Franke¹ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ²Institut de Ciencia de Materials de Barcelona, Campus de Bellaterra, 08193 Bellaterra (Barcelona), Spain — ³The Surface Science Research Center, The University of Liverpool, L69 3BX, United Kingdom

Alkali metals are perfect candidates for varying the electronic structure in molecular environments. Acting as electron donors with a low ionization potential, they easily build charge transfer complexes under the presence of an acceptor molecule. We investigated such a charge transfer process in a monolayer of the acceptor molecule 7,7,8,8,-tetracyanoquinodimethane (TCNQ) doped with Na on a Au(111) surface, using low-temperature scanning tunneling microscopy and spectroscopy. The self-assembled Na-TCNQ phase shows a Kondo resonance centered on the cyano-terminations of the TCNQ molecules, which proves the presence of an unpaired electron in the complex. Ab initio calculations corroborate the transfer of the Na's 3s electron to the organic acceptor and reveal its localization at the cyano groups.