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Please briefly answer all the questions below, and writing those clearer and tidier (It is best...

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Physics

Please briefly answer all the questions below, and writing thoseclearer and tidier (It is best to use typing)

This is a problem related to the scanning tunneling microscopy(TEM).

  1. Please describe how the constant-current and constant-heightmodes work in obtaining a scanning tunneling microscopicimage.
  2. What does the STM image contrast represent at the sample biasgoes form the negative to the positive?
  3. Please explain why scanning tunneling microscopy can achieveatomic resolution on the surface of a conducting substrate.

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