A simple method for constructing a consistent set of secondary-electron spectra from related theoretical and experimental data is reviewed. The method enables one to extend the spectra to the range of variables (e.g., primary and secondary-electron energies) not covered by experimentation. As an illustration, recommended spectra for electron impact on He and N2 are presented. For incident protons of moderate energy (<300 keV) charge transfer to the hydrogen continuum accounts for a substantial fraction (<25%) of the total ionization cross section. Suggestions are given for desirable experiments that would be useful in determining reliable secondary-electron spectra.

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