Diffraction of electrons at a polycrystalline lattice (Debye-Scherrer diffraction)

VP6.1.5.1
Diffraction of electrons at a polycrystalline lattice (Debye-Scherrer diffraction)
Diffraction of electrons at a polycrystalline lattice (Debye-Scherrer diffraction)

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Description

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 555626  4  Electron diffraction tube LD
1 555600 Tube stand LD
1 52170 High-voltage power supply, 10 kV LD
1 31154  4  Precision vernier callipers LD
1 500611  4  Safety connecting lead, 25 cm, red LD
1 500621  4  Safety connecting lead 50 cm, red LD
1 500641  4  Safety connecting lead, 100 cm, red LD
1 500642  4  Safety connecting lead, 100 cm, blue LD
2 500644  4  Safety connecting lead, 100 cm, black LD
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