Equipment for Crystal Structure using Electron Diffraction
Equipment for Crystal Structure using Electron Diffraction
Equipment for Crystal Structure using Electron Diffraction
Electron Diffraction Pattern
Electron Diffraction Pattern
Electron Diffraction Pattern
Electron Diffraction Pattern
Tel-Atomic Electron Diffraction Tube Diagram

 

Code Number: 7A60.10

Demo Title: Crystal Structure using Electron Diffraction

Condition: Fair

Principle: Determination of lattice structure

Area of Study: Modern Physics

Equipment: 

5 kV Power Supply, Electron Diffraction Tube (Tel-Atomic), Tube Stand, Camera and Power Supply.

Procedure:

Set the unit up as shown and according to the circuit diagram. Turn on the power supply and allow a short time for the filament to warm up. Push up the slide switch and observe the diffraction rings form. Aim the camera at the screen on the end of the tube. See the information in the files about tube parameters and target makeup. (Carbonized Graphite on Ni.)

When using the larger Sargent-Welch unit do not look at the screen for extended lengths of time as there is the possibility of X-rays coming from the tube.  Instead, mount a video camera in front of the screen when using in class.

References:

  • C. J. Calbick, " The Discovery of Electron Diffraction by Davisson and Germer", TPT, Vol. 1, # 2, May 1963, p. 63.
  • Johanna L. Miller, "Electron diffraction sees hydrogen atoms", Physics Today, March 2017, p. 16-17.
  • John M. Fowler, William Warren, "Lecture Demonstration of Electron Diffraction", AJP, Vol. 30, # 12, Dec. 1962, p. 891.
  • W. Bolton, "Electron Diffraction", Book 2 - Waves and Particles, Physics Experiments and Projects, 1968, p. 53.
7A60.10 - Crystal Structure Using Electron Diffraction