Electron Diffraction

Item Code: SN1030

Principle and Working:

When a polycrystalline graphite foil is illuminated by electron, it is diffracted by the various lattice plane within the crystal. This wave property of electron thus proves the de-Broglie's principle i.e. electrons are waves. In the fluorescent screen, the diffraction pattern is observed around a central bright spot. The diffraction patterns formed here satisfy Bragg's law.




  • Electron Diffraction Tube with guide pin (Plastic).
  • DC variable voltage from 0-5 KV , fixed 6.3V AC.
  • Power Supply with Analogue display.
  • Diffraction Patterns are noticed on fluorescent screen.
  • High current safety wires.

  • Measuring the diameters of the two diffraction rings for different accelerator voltages.
  • Determining the wavelength of the electrons for different accelerator voltages by applying the Bragg condition.
  • Confirming the de Broglie equation for the wavelength.

  • Power Supply: Voltage 0-5kV DC, max. 2 mA, Heater voltage 6.3 V AC, max. 3 A, Overload protection fuse & current limiting resistors, 4 mm safety sockets, High-voltage display Analogue, Weight 3.5 kg approx.
  • Tube Holder : 4 mm safety sockets, Dimensions 130x190x250 mm³, Weight 570 g.
  • Safety Leads : Wire cross – section 2.5 mm2, Continuous current 32 A, Plug and jack 4 mm, Qty. 15, Length 75cm, Color red, black and blue.
  • Electron Diffraction Tube : Max. filament voltage 6.3 V AC, Max. anode voltage 5 kV, Anode current 0.1 mA at 4 kV, Lattice constant of graphite d10 = 0.213 nm; d11 = 0.123 nm
  • 1 Power Cord
  • 1 Vernier Caliper (Additionally)
  • 1 Electron diffraction tube S
  • 1 Tube holder S
  • 1 High voltage power supply 5kV (230V)
  • 1 Set of 15 safety experiment leads
  • 1 Small magnet with holder