Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 105: Scanning Probe Techniques II: Method Development (joint session O/CPP)

O 105.3: Talk

Thursday, March 19, 2020, 11:00–11:15, WIL C107

Tip induced configuration change of a CO molecule on a copper surface — •Norio Okabayashi¹, Thomas Frederiksen^2,3, and Franz J. Giessibl⁴ — ¹Kanazawa University — ²Donostia International Physics Center — ³Basque Foundation for Science — ⁴University of Regensburg

Live coverage of a reaction process between the two atomic scale objects is one of the central goals in nanoscience. This can be achieved by combining atomic force microscopy to measure the potential energy between the tip apex and a molecule on a surface and inelastic electron tunneling spectroscopy (IETS) to measure the vibrational state of the molecule in the force field [1,2]. Here we demonstrate that the configuration change of a CO molecule in the force field produced by the tip can be traced with unprecedented quality by combining these two techniques and density functional theory (DFT). We found that when the tip is located laterally just above the CO molecule with upright configuration on a copper surface and approaches to the molecule, the CO molecule keeps the upright configuration from the attractive force regime to the beginning of the repulsive force regime; with further approaching the tip, the CO molecule suddenly changes its configuration from upright to tilted with the angle of 20 degree from the surface normal. This scenario is confirmed by IETS with adopting isotope 13C16O and 12C18O molecules. [1] N. Okabayashi, A. Peronio, M. Paulsson, T. Arai, and F. J. Giessibl, PNAS 115, 4571 (2018). [2] A. Peronio, N. Okabayashi, F. Griesbeck, and F. J. Giessibl, Rev. Sci. Instrum. (in press)