Singly differential cross section (with respect to outgoing electron energy) in single ionization Compton scattering from helium. Results for incident photon energies of 25 keV and 150 keV are displayed. The maximum outgoing electron energy (free Compton scattering edge), in Compton scattering from a free electron at rest, is 2.2 keV (for 25 keV incident photons) and 55.5 keV (for 150 keV incident photons). Above these energies the singly differential cross sections decrease rapidly with increasing energy.
