'phTph exP(phi/Tph)-1

where aph = 2.404. If the electrons are also isotropic, the effective cross section cr(Eph2, E) of generation of the photons with energy E during scattering of thermal photons with temperature Tph by electrons with energy E will be obtained by integrating Eq. 1.11.1 and taking into account Eq. 1.11.4:

4a ph

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