Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 49: Surface Chemical Reactions and Heterogeneous Catalysis III
O 49.6: Vortrag
Mittwoch, 2. April 2014, 11:45–12:00, PHY C 213
Chemical reactions and electronic structure of single molecules at surfaces — •Alexander Riss1,2, Sebastian Wickenburg1, Liang Z. Tan1,3, Hsin-Zon Tsai1, Patrick Gorman1, Dimas G. de Oyteza1,4, Yen-Chia Chen1,3, Steven G. Louie1,3, Felix R. Fischer1,3, and Michael F. Crommie1,3 — 1University of California, Berkeley, USA — 2Institute of Applied Physics, Vienna University of Technology, Austria — 3Lawrence Berkeley National Laboratory, Berkeley, USA — 4Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, San Sebastián, Spain
We investigated intra- and intermolecular reactions by imaging the chemical structure of single molecules by non-contact atomic force microscopy (nc-AFM). Additionally we used scanning tunneling microscopy and spectroscopy (STM/STS) to probe how coupling of molecules affects their electronic properties. In our studies we:
- resolved the structural changes and bond rearrangements associated with complex cyclization cascades of enediyne molecules [1],
- revealed multiple steps of cyclization and coupling reaction mechanisms by real-space identification of intermediate species, and
- probed the combined structural and electronic properties of conjugated polymers formed through radical coupling reactions. We observed the formation of a low-energy 1D conducting channel along the backbone of polymer chains, which can be explained by pi-orbital overlap between monomer building blocks [2].
[1] D.G. de Oteyza et al.; Science 340, 1434--1437 (2013)