Generalized Einstein Relation and Negative Differential Conductivity in Gases

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<jats:p>Transport coefficients of charged particles undergoing both elastic and inelastic collisions with a gas of neutral molecules are calculated using momentum-transfer theory. A criterion is obtained for the phenomenon of negative differential conductivity (i.e. the drift velocity decreasing with applied electric field) and the well-known generalized Einstein relation is appropriately modified.</jats:p>

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