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Here we show scanning tunnelling microscopy (STM), non-contact atomic forcemicroscopy (AFM) and inelastic electron tunnelling spectroscopy (IETS)measurements on organic molecule with a CO- terminated tip at 5K. Thehigh-resolution contrast observed simultaneously in all channels unam-biguously demonstrates the common imaging mechanism in STM/AFM/IETS, related tothe lateral bending of the CO-functionalized tip. The IETS spectroscopy revealsthat the submolecular con- trast at 5K consists of both renormalization ofvibrational frequency and variation of the amplitude of IETS signal. Thisfinding is also corroborated by first principles simulations. We extend accord-ingly the probe-particle AFM/STM/IETS model to include these two mainingredients necessary to reproduce the high-resolution IETS contrast. We alsoemploy the first principles simulations to get more insight into differentresponse of frustrated translation and rotational modes of CO-tip duringimaging.

Submolecular resolution by variation of IETS amplitude and its relation to AFM/STM signal