Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures IV
O 64.11: Vortrag
Mittwoch, 14. März 2018, 17:45–18:00, MA 004
Controlled dissociation of intramolecular bonds by STM manipulation — •Donato Civita1, Stefan Hecht2, and Leonhard Grill1 — 1Department of Physical Chemistry, University of Graz, Austria — 2Institute of Chemistry, Humboldt-Universität zu Berlin, Germany
Manipulation of molecules adsorbed at surfaces is very appealing to control and understand fundamental chemical processes. Chemical reactions can be triggered in single molecules by using the energy of the tunneling electrons in a scanning tunneling microscope (STM). Specifically, chemical bonds within molecules can be cleaved [1], the resulting fragments can be pulled across the surface by lateral manipulation with the STM tip and even new bonds can be formed [2].
In this work, we study the dissociation of single Br atoms from dibromoterfluorene (DBTF) molecules adsorbed on the Ag(111) surface. Experiments were done with a low temperature STM and applying voltage pulses where the Br substituents are located. By studying the current signal during the voltage pulse as well as imaging the single molecule before and after such a manipulation, we obtain insight into the process. After dissociation, single Br atoms and the remaining molecule are laterally dislocated over the surface, which reveals details about the interatomic interactions.
[1] B. C. Stipe, M. A. Rezaei, W. Ho, S. Gao, M. Persson, and B. I. Lundqvist, Phys. Rev. Lett. 78, 4410 (1997)
[2] S.-W. Hla, L. Bartels, G. Meyer, and K.-H. Rieder, Phys. Rev. Lett. 85, 2777 (2000)