# Illustration Compton Scattering (Photon-Electron Scattering)

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A photon with wavelength $$\lambda$$ and momentum $$\boldsymbol{p}$$ is scattered by a resting electron. After the scattering process, the wavelength of the photon has changed to the value $$\lambda'$$. The momentum of the photon has also changed to $$\boldsymbol{p}'$$. The electron has gained momentum $$\boldsymbol{P}'$$ due to the scattering.

The angle between the two photon momentum vectors is $$\theta$$.