Ambipolar diffusion coefficients for discharges in attaching gases

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Abstract
A general expression is given for the ambipolar diffusion coefficients in a gas discharge plasma containing an arbitrary mixture of electrons and positive and negative ions. Specific examples of coefficients for three-component active discharges and afterglows (electrons, one type of singly charged negative ion, one type of singly charged positive ion) are presented. The general expression is also used to clarify the limitations associated with the coefficients for a three-component plasma published by Thompson (1959). The limitations are significant.

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