Mobilities and Longitudinal Diffusion Coefficients of Mass-Identified Potassium Ions and Positive Nitric Oxide Ions in Nitric Oxide

We have measured in a drift-tube mass spectrometer the mobilities of N${\mathrm{O}}^{+}$, N${\mathrm{O}}^{+}$ · NO, and ${\mathrm{K}}^{+}$ ions in NO 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. The zero-field reduced mobilities were found to be 1.91 ± 0.06, 1.78 ± 0.05, and 2.245 ± 0.067 ${\mathrm{cm}}^2$/V sec, respectively. Measurements were also made of the longitudinal diffusion coefficients of N${\mathrm{O}}^{+}$ and ${\mathrm{K}}^{+}$ ions in nitric oxide at 300 °K as a function of $\frac{E}{N}$. Our results are in fair agreement with those predicted by the Einstein equation from the experimental zero-field mobilities.