Abstract
The decay of positive and negative ions was measured using a pulsed electron beam, high-pressure mass spectrometer. The decay of the plasma was found to be highly dependent on the ionizing electron current, i.e. the initial plasma density. The positive-ion-electron ambipolar diffusion, which was observed for an electropositive gas, disappears with an addition of an electronegative gas, CCl 4. The high-mode diffusion for positive ions was evident. The rate of the clustering reaction Cl − + H 2O → Cl −·H 2O was found to be much slower than that of Cl − + CH 3COCH 3 → Cl −·CH 3COCH 3. The difference in rates for these two reactions is proposed to be due to the difference in the way Cl − interacts with H 2O and CH 3COCH 3 molecules.
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