In 1924 Louis DeBrogle predicted that the wavelength associated with moving, massive particles should be the same as that for photons of the same momentum. That is, that
where h is Planck's constant and p is the momentum. If this assertion is true, then a beam of particles should be diffracted or scattered in the same way as a beam of light. It is the purpose of this experiment to demonstrate and measure this wave-like property of moving particles. The particles are electrons and they will be diffracted from crystalline material; namely, polycrystalline aluminum and pyrolitic graphite. This experiment will also afford a more detailed study of the crystal structure of these elements.