NEGATIVE ION REACTIONS IN NO-H2O MIXTURES
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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A stationary afterglow system has been utilized to determine rate constants for thermal energy negative ion-molecule reactions in photoionized NO- H2O mixtures. When the decay of the plasma is controlled by ambipolar diffusion of positive and negative ions quantitative determination of rate constants is shown to be feasible. The plasma transition from electron-positive ion ambipolar diffusive domination of the transport loss processes to domination by positive ion-negative ion ambipolar diffusion is explained by a model which includes the effects of negative ion trapping. Prominant negative ions in the afterglow include NO2-, its hydrates, and clusters involving HNO2. Steady glows in NO- H2O-O2 mixtures revealed that NO3- and the impurity HCO3- also formed multiple hydrates and clustered with HNO2. These results indicate that the terminal negative ions in the D-region of the ionosphere will likely be hydrated.
- Atmospheric Physics
- Radiation and Nuclear Chemistry