### Klein-Nishina formula

(formula for the effects of electrons scattering photons)

The **Klein-Nishina formula** is an equation yielding the differential cross section
of a free electron that is scattering a photon, either
Thomson scattering or Compton scattering, depending upon
the frequency of the EMR. It was an improvement on the
Thomson scattering formula. The **differential cross section** can
be a stepping stone to calculating other values.

(*physics,mathematics,photons*)
**Further reading:**

http://en.wikipedia.org/wiki/Klein-Nishina_formula

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