title: The frontier orbitals of a push-pull azobenzene adsorbed on a metal surface in different bonding geometries investigated by scanning tunneling spectroscopy and spectroscopy mapping.
abstract: The electronic structure of 4-anilino-4'-nitroazobenzene superstructures formed on Au(111) at 250 K is investigated by low temperature scanning tunneling microscopy, scanning tunneling spectroscopy, and dI/dV mapping at 5 K. Changes in the dI/dV maps of this push-pull molecule reflect the spatial distribution of the frontier orbitals on the molecular scale. Spectra of the trans- and the cis∗-isomer differ between themselves and in different parts of supramolecular assemblies. The relative importance of these differences is discussed.
authors.affiliation: Institut für Festkörperphysik, Abteilung für atomare und molekulare Strukturen (ATMOS), Leibniz Universität Hannover, Appelstr. 2, D-30167 Hannover, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Henzl
authors.forename: Karina
authors.initials: K
authors.lastname: Morgenstern