Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.30: Poster
Wednesday, March 28, 2012, 18:15–21:45, Poster B
Revealing molecular dynamics through Scanning Noise Microscopy and Spectroscopy — •Johannes Schaffert1, Maren C. Cottin1, Andreas Sonntag1, Hatice Karacuban1, Christian A. Bobisch1, Nicolás Lorente2, Jean-Pierre Gauyacq3, and Rolf Möller1 — 1Faculty of Physics, Center for Nanointegration Duisburg- Essen, University of Duisburg-Essen, 47048 Duisburg, Germany — 2Centre d'Investigació en Nanociència i Nanotecnologia (CSIC-ICN), Campus UAB, E-08193 Bellaterra, Spain — 3Institut des Sciences Moléculaires d'Orsay, CNRS-Université Paris-Sud 11, UMR 8214, Bâtiment. 351, Université Paris-Sud, F-91405 ORSAY Cedex, France
We show how by adding the real-time characterization of the tunnelling current noise to the standard operation of Scanning Tunneling Microscopy (STM), switching processes on surfaces can be analyzed. This kind of Scanning Noise Microscopy (SNM) was applied for individually adsorbed organic CuPc molecules on Cu(111). It reveals excitation spectra as well as excitation maps with Angstrom spatial resolution. The Noise Spectroscopy clearly exhibits the molecular orbitals LUMO, HOMO and HOMO-1, which could be observed by conventional Scanning Tunneling Spectroscopy only faintly. The mechanism of the molecular switch could be identified as an in-plane libration between the ground state and two transiently occupied states. The findings are confirmed by Density Functional Theory calculations.