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.
- To measure the diameter of the two smallest diffraction rings
at different anode voltages.
- To calculate the wavelength of the electrons from the anode
- To determine the interplanar spacing of graphite from the
relationship between the radius of the diffraction rings and the
What you can learn about
- Bragg reflection
- Debye-Scherrer method
- Lattice planes
- Graphite structure
- Material waves
- De Broglie equation