Davison and Germer's and G.P. Thomson's experiments gives:

Davisson-Germer experiment was conducted by two American scientists Clinton Davisson and Lester Germer, in 1927, to verify the de Broglie hypothesis that a material particle posses wave nature. They experimentally proved the wave nature of electrons via diffraction of electron beam by the nickel crystal. It gives evidence of de Broglie's waves associated with electrons.