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• W1982795406 abstract "Ambipolar diffusion and electron attachment rates were measured in nitric oxide at pressures from 0.01 to 16 Torr and at temperatures from 196 to 358ifmmode^circelsetextdegreefi{}K. The gas was photoionized by single pulses of ultraviolet radiation, at and near Lyman-$ensuremath{alpha}$ from a hydrogen lamp. Pulse lengths ranged from 10 to 300 ensuremath{mu}sec and ionization levels were kept low to reduce electron-ion recombination. Rates for the latter process are reported in a separate paper. Electron loss rates were measured by a microwave-cavity method used to record the decay following a single ionizing pulse. Ion identification was made by a mass spectrometer which sampled the ions diffusing through a small hole in the wall of the microwave cavity. Ultrahigh-vacuum techniques were used in gas purification and in production and measurement of ionization. The diffusion results are to some extent consistent with the theory of diffusion of electrons and a single positive ion species in the presence of negative ions. The mass-spectrometer observations indicate that ${mathrm{NO}}^{+}$ is the dominant positive ion in photoionized NO at all pressures. The measured mobility of ${mathrm{NO}}^{+}$ for 298ifmmode^circelsetextdegreefi{}K, referred to 0ifmmode^circelsetextdegreefi{}C and 760 Torr, is 1.9ifmmodepmelsetextpmfi{}0.2 ${mathrm{cm}}^{2}$ ${mathrm{sec}}^{ensuremath{-}1}$ ${mathrm{V}}^{ensuremath{-}1}$, corresponding to a ${D}_{a}p$ of 83ifmmodepmelsetextpmfi{}8 ${mathrm{cm}}^{2}$ Torr ${mathrm{sec}}^{ensuremath{-}1}$. The mobility decreases slowly as the gas temperature is raised from 196 to 358ifmmode^circelsetextdegreefi{}K. At gas densities near ${10}^{17}$ ${mathrm{cm}}^{ensuremath{-}3}$, the attachment results are characteristic of a three-body process, but at higher densities there is an anomalous rise in the attachemnt coefficient. The apparent three-body attachment coefficients for densities near ${10}^{17}$ ${mathrm{cm}}^{ensuremath{-}3}$ are 6.8ifmmodepmelsetextpmfi{}0.7ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}31}$ ${mathrm{cm}}^{6}$ ${mathrm{sec}}^{ensuremath{-}1}$ at 196ifmmode^circelsetextdegreefi{}K, 2.2ifmmodepmelsetextpmfi{}0.2ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}31}$ at 298ifmmode^circelsetextdegreefi{}K, and 1.1ifmmodepmelsetextpmfi{}0.1ifmmodetimeselsetexttimesfi{}${10}^{ensuremath{-}31}$ at 358ifmmode^circelsetextdegreefi{}K and exhibit approximately at ${T}^{ensuremath{-}3}$ temperature dependence. The principal negative ion observed with the mass spectrometer was ${mathrm{NO}}_{2}^{ensuremath{-}}$, and no ${mathrm{NO}}^{ensuremath{-}}$ or ${(mathrm{NO})}_{2}^{ensuremath{-}}$ ions were detected. Direct attachment to ${mathrm{NO}}_{2}$, present as a minute impurity, seems unlikely; the ${mathrm{NO}}_{2}^{ensuremath{-}}$ ions may be formed by rapid charge transfer from a primary negative ion or by an attachment reaction involving rearrangement." @default.
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• W1982795406 date "1965-11-01" @default.
• W1982795406 modified "2023-09-27" @default.
• W1982795406 title "Ambipolar Diffusion and Electron Attachment in Nitric Oxide in the Temperature Range 196 to 358°K" @default.
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• W1982795406 doi "https://doi.org/10.1103/physrev.140.a748" @default.
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