Abstract
A new mass spectrometer ion source has been developed to study high-pressure ion molecule kinetics and equilibria as a function of temperature. Unlike conventional mass spectrometer sources, the present source has coaxial electron entrance and ion exit apertures. Ions move through the source at a constant velocity due to the presence of a constant drift potential gradient. Low drift fields are used to minimize non-thermal conditions. The effect of the field on ion energy is discussed. As both a demonstration and a test of the source operation, mobilities of ions in gases were studied as a function of drift field, pressure and temperature. Good agreement was obtained with previously reported mobility measurements. The ternary association reaction N 2 + + 2N 2 → N 4 + + N 2 and the equilibrium CO 2 + + 2CO 2 ⇆ (CO 2) 2 + + CO 2 were also investigated as a function of temperature and pressure. Again, good agreement between literature values and these experiments was obtained.
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