Technical data

Electron diffraction

Article no: P2511301

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Principle

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.

Benefits

Experience the essence of the Nobel Prize: de Broglie (1929)
Impressive visualization of a Nobel Prize experiment with various changeable parameters
Simple setup
Easy determination of the interplanar spacing of graphite
Perfect demonstration of wave-particle duality

Tasks

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.

Learning objectives

Bragg reflection
Debye-Scherrer method
Lattice planes
Graphite structure
Material waves
De Broglie equation

Scope of delivery

Electron diffraction tube	06721-02	1
Holder for electron diffraction tube	06721-03	1
Operating unit for electron diffraction tube 230 V	06721-04	1
Safety experiment cable for electron diffraction tube	06721-05	1