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A voltage induces electrons to jump from the probe's tip to the sample atoms.
A voltage induces electrons to jump from the probe's tip to the sample atoms. - Scanning Tunneling Microscope - How Nanoscientists see Atoms
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The heart of the STM is an atomically sharp probe.
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But how can it move the probe over these tiny nanometer distances?
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Voltages to a piezoelectric crystal move the probe in and out.
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Another crystal moves it side to side.
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A third crystal moves it up and down.
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