Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 38: Metal substrates: Adsorption of atoms and inorganic molecules
O 38.3: Talk
Tuesday, March 13, 2018, 14:30–14:45, MA 144
Interaction process of a CO molecule on a copper surface with a metallic tip of a microscope — •Norio Okabayashi1,2, Angelo Peronio2, Daniel Meuer2, Sonia Matencio2, Ferdinand Huber2, Magnus Paulsson3, Toyoko Arai1, and Franz J. Giessibl2 — 1Kanazawa University, Kanazawa, Japan — 2University of Regensburg, Regnsburg, Germany — 3Linnaeus University, Kalmer, Sweden
In order to investigate the vibrational state of a CO molecule put in the force field by a metallic tip, we have developed a method combining atomic force microscopy and inelastic electron tunneling spectroscopy (IETS). In previous, we reported that considering the bond elongation is crucial to reproduce the vibrational energy shift in the force field as well as the linear superposition of the perturbed force. We also reported that the distance dependent IETS intensity can be interpreted by combining the concept of the bond elongation with our previous finding on the IETS intensity [1] that the intensity strongly depends on the fraction of the current passing through the molecule. Here we have improved our method by stabilizing the tip oscillation during the IETS measurements and extended the measurements to the smaller tip molecule distance for the system of a CO molecule on a Cu(111) surface. We demonstrate that the improved data provides the interpretation consistent with our previous conclusion along with the new insight into the tip molecule interaction process. [1] N. Okabayashi, A. Gustafsson, A. Peronio, M. Paulsson, T. Arai, and F. J. Giessibl, Phys. Rev. B 93, 165415 (2016).