Double differential cross sections for electron ejection from helium by fast protons

Measurements of the angular and energy distributions of electrons ejected from helium atoms by protons with energies between 20 and 100 keV are presented in tabular and graphical form. The electron energy range is between 5 and 100 eV and the angular range is between 0 and 100 degrees. The distributions have been converted to double differential cross sections by normalisation against other published data. An analysis of the accuracy of the results is presented.

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