Electron diffraction
Fast electrons are diffracted from a polycrystalline layer of graphite: interference rings appear on a fluorescent screen. The interplanar spacing in graphite is determined from the diameter of the rings and the accelerating voltage.
Electron diffraction tube with holder and operating unit
- To measure the diameter of the two smallest diffraction rings at different anode voltages.
- To calculate the wavelength of the electrons from the anode voltages.
- To determine the interplanar spacing of graphite from the relationship between the radius of the diffraction rings and the wavelength.
- Bragg reflection
- Debye-Scherrer method
- Lattice planes
- Graphite structure
- Material waves
- De Broglie equation