Diffraction of Electrons at a Polycrystalline Lattice (Debye-Scherrer Diffraction) Experiment

The experiment P6.1.5.1 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 microcrystals 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, so that for the angular aperture of the diffraction rings we can say

Components of Equipment Sets:

1	555 626	Electron diffraction tube
1	555 600	Tube stand
1	521 70	High-voltage power supply, 10 kV
1	311 54	Precision vernier callipers
1	500 611	Safety connecting lead, 25 cm, red
1	500 621	Safety connecting lead, 50 cm, red
1	500 641	Safety connecting lead, 100 cm, red
1	500 642	Safety connecting lead, 100 cm, blue
2	500 644	Safety connecting lead, 100 cm, black

Instructions for Use Click Here

Materials and equipment for teaching Physics labs, advanced science experiment apparatus, Leybold