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Davisson–Germer experiment
Intermediate
Electron diffraction confirmed matter waves.
Electrons scattered from a nickel crystal showed diffraction peaks at angles matching λ = h/p, confirming matter waves in 1927.
54 eV electrons gave a peak at 50°.
Followed by diffraction of atoms and molecules.
In more detail
In the Davisson-Germer experiment, electrons scattered from a nickel crystal produced diffraction patterns, confirming their wave nature and the de Broglie relation.
Real-world uses
- Electron diffraction is used to study crystal structures.
- Surface science uses low-energy electron diffraction.
- Electron diffraction is used to determine the crystal structure of materials and molecules.
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Frequently asked questions
Why was a crystal used?
Its atomic spacing is comparable to the electron wavelength, giving measurable diffraction.
What did it prove?
That electrons behave as waves with the wavelength predicted by de Broglie.
Why did electron diffraction matter?
It confirmed that matter has wave properties, which was a key step in developing quantum mechanics.
Related topics in Quantum Mechanics
Compton effect · Pair production · de Broglie hypothesis · Wave–particle duality · Double slit with electrons · Heisenberg uncertainty principle