Existing data on the ionization of neutral atoms and molecules by proton impact are reviewed, and electron production cross-section data are collected. The three major experimental methods are discussed and possible sources of error identified. Some theoretical cross sections are discussed, and well-established methods of relating them to measured cross sections are reviewed. A mathematical equation is fitted to the weighted experimental data for each target, and these fits are adjusted to be consistent with appropriate theoretical calculations and with electron impact and photoionization data. Recommended values of total cross sections for proton-impact ionization are given.
M. E. Rudd et al., "Electron Production in Proton Collisions: Total Cross Sections," Reviews of Modern Physics, vol. 57, no. 4, pp. 965-994, American Physical Society (APS), Oct 1985.
The definitive version is available at https://doi.org/10.1103/RevModPhys.57.965
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