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The absolute triply differential cross section for relativistic electron-impact ionization of the subshell of gold has been measured in an (e, 2e) coincidence experiment as a function of the scattering angle of the outgoing slow electrons. A primary electron energy of 300 keV, coplanar asymmetric geometry and kinematical conditions to match the bound-electron Bethe ridge have been chosen. The agreement with theoretical results obtained in the relativistic distorted-wave Born approximation is good, while the discrepancies with the semirelativistic Coulomb - Born approximation are somewhat larger.
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Kull et al. (1997) studied this question.
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