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单词 scanning tunnelling microscope
释义
scanning tunnelling microscope

Chemistry
  • A type of electron microscope that uses the quantum-mechanical tunnel effect to study atomic structures and observe single atoms. A fine-pointed conducting tip near a surface of a sample causes electrons to tunnel from the surface to the tip. Its occurrence depends on the electron density of the surface and the distance between the tip and the surface itself. The electric current produced is kept constant by moving the tip up or down as moves across the surface.


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