Compton Scattering is an inelastic scattering of a photon by a free charged particle, usually electron. It results in a decrease in energy (increase in wavelength) of the photon (which may be an X-ray or gamma ray photon), called the Compton effect. Part of the energy of the photon is transferred to the scattering electron. Inverse Compton scattering also exists, in which a charged particle transfers part of its energy to a photon.
Read more about Compton Scattering: Introduction, Description of The Phenomenon
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