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Achieving a high intensity in inelastic scanning tunneling spectroscopy(IETS) is important for precise measurements. The intensity of the IETS signalcan vary up to a factor three for various tips without an apparent reasonaccessible by scanning tunneling microscopy (STM) alone. Here, we show thatcombining STM and IETS with atomic force microscopy enables carbon monoxidefront atom identification, revealing that high IETS intensities for CO/Cu(111)are obtained for single atom tips, while the intensity drops sharply formulti-atom tips. Adsorbing the CO molecule on a Cu adatom [CO/Cu/Cu(111)] suchthat it is elevated over the substrate strongly diminishes the tip dependenceof IETS intensity, showing that an elevated position channels most of thetunneling current through the CO molecule even for multi-atom tips, while alarge fraction of the tunneling current bypasses the CO molecule in the case ofCO/Cu(111).

physical review. b./physical review. b

Influence of atomic tip structure on the intensity of inelastic  tunneling spectroscopy data analyzed by combined scanning tunneling  spectroscopy, force microscopy and density functional theory