Abstract
We have developed a method to observe the destruction rate of H 3 + in the positive column, which is limited by ambipolar diffusion. This method is based on the competition between the ambipolar diffusion rate and destruction rate by added impurities. The decrease of a velocity modulated H 3 + absorption signal was studied when small amounts of CH 4, N 2, and CO were added to a pure hydrogen AC positive column discharge. The destruction rate constant of H 3 + due to ambipolar diffusion was then obtained using a steady-state model and previously reported ion-neutral reaction rate constants.
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