Mobilities and Longitudinal-Diffusion Coefficients of Mass-Identified Positive Ions in Carbon Monoxide Gas

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We have measured with a drift-tube mass spectrometer the mobilities of CO⁺, CO⁺·{}CO, and C⁺ ions in carbon monoxide gas at 300 ^∘{}K. The measurements were made over a substantial range of E/N, where E is the drift-field intensity and N is the gas number density. Zerofield reduced mobilities were determined for CO⁺·{}CO and C⁺ ions. Their values are 1.90 ±{} 0.03 and 2.7 ±{} 0.1 cm²/V sec, respectively. Measurements were also made of the longitudinal-diffusion coefficient of CO⁺ ions in CO at 300 ^∘{}K as a function of E/N.