Browsing by Author "Pethica, J. B."
Now showing items 1-8 of 8
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Direct measurement of interatomic force gradients using an ultra-low-amplitude atomic force microscope
(The Royal Society Publishing, 2001)Interatomic force gradients between a W tip and a 7 × 7 reconstructed Si(111) surface were measured using an off-resonance, ultra-low-amplitude atomic force microscope (AFM) technique. The amplitudes used were less than 1 ... -
Direct measurement of molecular stiffness and damping in confined water layers
(The American Physical Society, 2004)We present direct and linear measurements of the normal stiffness and damping of a confined, few molecule thick water layer. The measurements were obtained by use of a small amplitude (0.36 Å), off-resonance atomic force ... -
Energy dissipation in atomic force microscopy and atomic loss processes
(American Physical Society, 2001)Atomic scale dissipation is of great interest in nanomechanics and atomic manipulation. We present dissipation measurements with a linearized, ultrasmall amplitude atomic force microscope which is capable of measuring ... -
High-sensitivity noncontact atomic force microscope/scanning tunneling microscope (nc AFM/STM) operating at subangstrom oscillation amplitudes for atomic resolution imaging and force spectroscopy
(American Institute of Physics, 2003-06-23)We describe a new, highly sensitive noncontact atomic force microscope/scanning tunneling microscope (STM) operating in ultrahigh vacuum (UHV) with subangstrom oscillation amplitudes for atomic resolution imaging and ... -
Low-amplitude, force gradient imaging of Cu(100) surface using tunnel current feedback
(Institute of Physics Publishing, 2004)The large corrugation amplitudes in scanning tunnelling microscope (STM) images of metal surfaces have been commonly attributed to the action of forces between the tip and the sample. We have investigated the Cu(100) surface ... -
Manipulation of atoms across a surface at room temperature
(Nature Publishing Group, 2000)Since the realization that the tips of scanning probe microscopes can interact with atoms at surfaces, there has been much interest in the possibility of building or modifying nanostructures or molecules directly from ... -
Nanomechanics using an ultra-small amplitude AFM
(Cambridge University Press, 2001)A new type of AFM is presented which allows for direct measurements of nanomechanical properties in ultra-high vacuum and liquid environments. The AFM is also capable to atomic-scale imaging of force gradients. This is ... -
Quantitative atom-resolved force gradient imaging using non contact-AFM/STM
(American Institute of Physics, 2001)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, ...
