Electron tube

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In the electron impact tube is one specifically for the Franck-Hertz experiment designed electron tube .
There are two versions of this for practical implementation: as a neon bump tube and as a mercury bump tube . (The difference essentially consists of the type of gas filling ). Both tubes have in common that they have a concentric structure:

  • There is a hot cathode in the center
  • There is a grid at a certain distance
  • There is an anode at a small distance compared to the cathode- grid distance .