Abstract

Atomic force microscopy (AFM) has become a versatile and powerful method for imagingboth insulating and conducting objects down to the atomic scale. By extending the highspatial resolution and sensitivity of AFM to the force spectroscopy dimension,oscillations of individual molecules can be studied with atomic resolution. Usingthree-dimensional mapping of the force and damping fields we address individualDy@C82 metallofullerene molecules confined inside single-walled carbon nanotubes(so-called metallofullerene peapods) and reveal their oscillatory behaviourvia attractive interactions with the AFM probe tip. The damping energyΔE signals, generated in very close proximity of the tip and nanotube peapod, show a closerelationship with hysteresis in the short-range forces, thereby indicating that a softvibrational (phonon) mode is site-specifically (i.e., atom-by-atom) induced by the AFM tip.

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