Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 49: Metal Substrates: Structure, Adsorption and Growth
O 49.8: Poster
Tuesday, March 8, 2016, 18:15–20:30, Poster E
Structure and electronic properties of triazatruxene layers on Ag(111) studied by LT-STM — •Anja Bauer1, Florian Singer1, Philipp Erler1, Markus Maier2, Rainer Winter2, Luca Gragnaniello1, and Mikhail Fonin1 — 1Fachbereich Physik, Universität Konstanz, Konstanz, Germany — 2Fachbereich Chemie, Universität Konstanz, Konstanz, Germany
We present a study of triazatruxene (TAT) molecules deposited on Ag(111) by means of electrospray ionization in ultra high vacuum. We investigated the structural and electronic properties of TAT molecules at different coverages by means of low temperature scanning tunneling microscopy (STM) and spectroscopy (STS). For coverages far below one monolayer we observe the molecular superstructures which are stabilized by long-range repulsive intermolecular interaction. High-resolution STM imaging reveals three different types of intramolecular structure, which are possibly due to different site-specific interaction between the molecule and the substrate. At coverages close to one monolayer we observe the formation of self-assembled structures. Here, three different packing types are observed. Depending on the exact surrounding of each molecule within the layer a strong variation in the orbital structure of the molecules is observed. We attribute this findings to a strong surface-enhanced dipol-dipol interaction between the molecules.