Absolute total cross sections for producing H+, H, e, N2+, and 02+ have been measured for H+ N, and H+02 collisions from 50-eV to 3-keV hydrogen-atom energy. The experimental techniques used, when combined with classical differential-scattering calculations, also allowed determinations of the absolute largeangle-scattering differential cross sections for H+ production. The experimental and theoretical procedures are reviewed, and the results are compared, where possible, with the data of other investigators.

Absolute cross sections for producing H+, H−, H+2, He+, and e− have been measured for fast hydrogen atom impact on H2 and He targets. The hydrogen atom energy ranged between 50 eV and 3.0 keV. For the H+H2 reaction, the dominant ion-formation process for hydrogen atom energies below 250 eV was found to be H−+H+2 production. For He targets, production of H+ dominated over the entire hydrogen atom energy range. The results are compared, where possible, with the data of other investigators and are discussed in terms of possible reaction mechanisms.

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