Davisson–Germer experiment
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The Davisson–Germer experiment was conducted from 1923 to 1927 by Clinton Davisson and Lester Germer at Western Electric. Electrons, scattered by the surface of a crystal of nickel metal, displayed a
Davisson and Germer in 1927
American Physical Society plaque in Manhattan commemorates the experiment
Graph of the electrical current vs electron beam azimuth angle from the 1927 "The Scattering of Electrons by a Single Crystal of Nickel" paper. The presence of peaks and troughs is consistent with a diffraction pattern and suggests a wave-like nature of electrons.
Bragg's law
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In many areas of science, Bragg's law – also known as Wulff–Bragg's condition or Laue–Bragg interference – is a special case of Laue diffraction that gives the angles for coherent scattering of waves
Typical selected area electron diffraction pattern. Each spot corresponds to a different diffracted direction.