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

We have measured with a drift-tube mass spectrometer the mobilities of C${\mathrm{O}}^{+}$, C${\mathrm{O}}^{+}$·CO, and ${\mathrm{C}}^{+}$ ions in carbon monoxide gas at 300 °K. The measurements were made over a substantial range of $\frac{E}{N}$, where $E$ is the drift-field intensity and $N$ is the gas number density. Zerofield reduced mobilities were determined for C${\mathrm{O}}^{+}$·CO and ${\mathrm{C}}^{+}$ ions. Their values are 1.90 ± 0.03 and 2.7 ± 0.1 ${\mathrm{cm}}^2$/V sec, respectively. Measurements were also made of the longitudinal-diffusion coefficient of C${\mathrm{O}}^{+}$ ions in CO at 300 °K as a function of $\frac{E}{N}$.