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Cross sections for production of electrons and positive ions by proton impact on water vapor have been measured from 7-4000 keV by the transverse-field method.

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Absolute cross sections for multiple ionization (oq) of He, Ne, Ar, and Kr are presented for proton-impact energies between 10 and 4000 keV. Charge states up to 6+ are observed for Kr.The results are obtained by measuring relative yields of multiply charged ions with a time-of-flight spectrometer and normalizing to total ion-production cross sections oz. =gqo~. The results are compared with existing protonand electron-impact data. Relative multiple-to single-ionization cross-section ratios are also presented for He+ impact.

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