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It's done by ratcheting this cylinder in until an electron current is sensed.
It's done by ratcheting this cylinder in until an electron current is sensed. - 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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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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