Hplus;, H2plus;, H3plus;, and H5plus;ions have been identified in hydrogen gas by use of a mass spectrometer with the ion source in the pressure range from 10minus;3to 0.5 mm Hg. Secondary ions are formed in steps of consecutive reactions between ions and hydrogen molecules. Reaction cross sections of the secondary H3plus;ions have been determined from the concentration dependence of the intensities of the H2plus;ions. The tertiary H5plus;ion is formed in threehyphen;body collisions of the H3plus;ion with the hydrogen molecules. Dissociation processes of all three molecular ions have been observed.
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