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Compton scattered photon energy

E′ = 83.63 keV

E′=E1+(E/mec2)(1−cos⁡θ),mec2=511 keVE' = \frac{E}{1+(E/m_ec^2)(1-\cos\theta)},\quad m_ec^2=511\,\mathrm{keV}

Scattered photon energy versus scatter angle for a free electron.

Laser