Diffusion in Decaying Plasmas

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Abstract
An iterative numerical technique has been employed to model the decay of plasmas in an electronegative gas, nitric oxide, and in an electropositive gas, helium. The spatial and temporal behavior of the charged species are followed and compared with experiments through four regimes: (1) positive ion‐electron ambipolar diffusion regime, (2) transition regime, (3) positive ion‐negative ion ambipolar diffusion regime for an electronegative gas, and (4) free diffusion regime for an electropositive gas. Densities of all charged‐particle species are calculated from Gauss' law. The structural features in the experimental measurements of decaying plasmas are reproduced in the results of the numerical calculation.

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