Distribution in energy and angle of electrons ejected from xenon by 0.3- to 2.0-MeV protons

Absolute cross sections, differential in electron energy and emission angle, have been measured for ejection of electrons from xenon by 0.3- to 2.0-MeV protons. Electron-energy distributions are presented for ten angles between 20° and 130°. Angular distributions are found to be more nearly isotropic than results for targets of lower atomic number. Cross sections differential in electron energy obtained by integration with respect to emission angle, are found to be in relatively good agreement with calculations based on binary-encounter theory. Auger electrons resulting from initial vacancies in the M and N shells of xenon are discussed. Estimates of total M- and N-shell ionization cross sections for fast protons are presented.