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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 transmission electronmicroscopy (TEM)

  1. What is the difference between the field-emission andthermionic source TEMs?
  2. What is the purpose of the Wehnelt in a thermionic source? Whydon’t we need one in a field emission gun(FEG)?
  3. Define ‘underfocused’ and ‘overfocused’ in the TEM?
  4. What causes spherical aberration and chromatic aberration?

Answer & Explanation Solved by verified expert
4.2 Ratings (806 Votes)
TEM is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an imageIn the field of optics we have always played with source to increase resolving power as in case of Michelson interferometer first we have used sodium lamp to get interferograms later to increase coherence length we have used laser source In    See Answer
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