Browsing by Subject "Scanning-tunneling-microscopy"

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    Quantitative atom-resolved force gradient imaging using non contact-AFM/STM
    (American Institute of Physics, 2001) Oral, A.; Grimble, R. A.; Ozer, H. O.; Hoffman, P. M.; Pethica, J. B.
    Quantitative force gradient images are obtained using a sub-angstrom amplitude, off-resonance lever oscillation method during scanning tunneling microscopy imaging. We report the direct observation of short-range bonds, and the measured short-range force interaction agrees well in magnitude and length scale with theoretical predictions for single bonds. Atomic resolution is shown to be associated with the presence of a prominent short-range contribution to the total force interaction. It is shown that the background longer-range interaction, whose relative magnitude depends on the tip structure, has a significant effect on the contrast observed at the atomic scale. (C) 2001 American Institute of Physics.