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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.

Cross sections for production of positive and negative charge for 10-300-keV/u ~e ' + ions on He, Ne, Ar, Kr, Hz, N2, CO, 02, CH4, N20, and C02 were measured by the transverse-field method. Single-and double-electron-capture cross sections at 5-150 keV/u for the same targets were measured by the method of deflection of different charge-state components of the beam after passing through a known length of target gas. A secondary-emission detector was used to detect the neutral component of the beam. A small least-squares adjustment of the cross sections was made to satisfy the equation u+ =a-+u2, +2uZ0 which follows from conservation of charge.

Cross sections for production of positive and negative charge for 10-2000-keV He+ ions on He, Ne, Ar, Kr, Hz, N2, CO, 02, CH4, and C02 were measured by the transverse-field method. Electron-capture and -loss cross sections for 5-350-keV He+ ions on the same targets were measured by the method of beam deflection of various charge states after passing through a known length of target gas. Secondary-emission detectors were used to detect neutral, singly charged, and doubly charged beam components. The equation a+ -a-= ulo -a l z relating the four measured cross sections was utilized to make a least-squares adjustment of the data.

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