Debye–Scherrer Diffraction

Dualism of waves and particles.

The experiment demonstrates diffraction of electrons at polycrystalline graphite. As in the Debye-Scherrer method with x-rays, we observe diffraction rings in the direction of radiation, which surround a central spot on a screen. These are caused by the diffraction of electrons at the lattice planes of microcrystal, which fulfill the Bragg condition. As the graphite structure contains two lattice-plane spacings, two diffraction rings in the first order are observed. The electron wavelength is determined by the acceleration voltage U.

Electron diffraction tube
Tube stand
High-voltage power supply 10 kV
Precision vernier calipers
Safety connection lead 25 cm, red
Safety connection lead 50 cm, red
Safety connection lead 100 cm, red
Safety connection lead 100 cm, blue
Safety connection lead 100 cm, black (2)