Compton scattering

Compton scattering is the scattering of photons from electrons. When Arthur Compton first explored this type of scattering experimentally by directing a beam of electrons onto a target crystal, he found that the wavelength of the scattered photons was longer than the wavelength of the photons incident on the target, and that larger scattering angles were associated with longer wavelengths. Compton explained this result by applying conservation of energy and momentum to the photon-electron collisions.