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  • Home
  • Introduction
  • Setup
  • Experiment
  • Discoveries
  • Bragg
    Equation
  • Fullfillment of the
    Conditions
  • Wavelength
  • Diffraction
    Order
  • Graphite Grating
  • Tasks

Observations and first qualitative results

  • In the middle of the screen one sees a bright green spot.
  • At distances r1 and r2 from this point one sees two less bright rings.
  • With increaing acceleration voltage, the distances r1 and r2 become smaller.
Powder Diffraction with a polycrystalline

Electron diffraction

When the electron beam passes through the polycrystaline graphite film, something must occur that produces the two rings to appear on the screen. The designation of the experimental setup as"electron diffraction tube" and recalling a Experiment - in which a laser beam passes through a slit or grating and a so-called interference pattern appears on the screen - provide first clues to what causes the spots.

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