STM / AFM Images Explanations from www.iap.tuwien.ac.at/www/surface/STM_Gallery/stm_schematic.html www.almaden.ibm.com/vis/stm/lobby.html www.nanoscience.com/education/STM.html Scanning Tunneling Microscopy
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Quantum mechanics tells us that electrons have both wave and particle like properties.
Tunneling is an effect of the wavelike nature. The top image shows us that when an electron (the wave) hits a barrier, the wave doesn't abruptly end, but tapers off very quickly. For a thick barrier, the wave doesn't get past.
The bottom image shows the scenario if the barrier is quite thin (about a nanometer). Part of the wave does get through, and therefore some electrons may appear on the other side of the barrier.
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The following explanation taken from
metaphase chromosomes on microscopy slidedimensions 83 µm * 83 µm
height image (left, 3D plot) and corresponding optical microscope image (above, bright field) of a moth wing scaleintermittent contact mode
scan field 10 µm * 10 µmz-range 0 - 1.7 µm
Height image (left, 3D plot) and corresponding optical microscope image (above, phase contrast) of a moth's eye - region of three adjacent facets. intermittent contact mode
scan field 10 µm * 10 µmz-range 0 - 6.0 µm
Atomic force microscope topographical scan of a glass surface. The micro and nano-scale features of the glass can be observed, portraying the roughness of the material.
Constructed at the Nanorobotics Laboratory at Carnegie Mellon University (http://nanolab.me.cmu.edu).
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