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The physical interpretation for the Davisson-Germer experiments on nickel(Ni) single crystals [(111), (100), and (110) surfaces] is presented in termsof two-dimensional (2D) Bragg scattering. The Ni surface acts as a reflectivediffraction grating when the incident electron beams hits the surface. The 2DBragg reflection occurs when the Ewald sphere intersects the Bragg rods arisingfrom the two-dimension character of the system. Such a concept is essential toproper understanding of the Davisson-Germer experiment for undergraduate modernphysics course.

A proper understanding of the Davisson and Germer experiments for undergraduate modern physics course