Expulsion of Free Electronic Charge from the Interior of a Metal

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Abstract
Using the frequency dependent conductivity, we show that electronic charge is expelled from the interior of a metal by setting up an oscillation driven by the Coulomb repulsion at the plasma frequency. This oscillation damps out in a time on the order of an electronic collision time. The usual textbook derivation does not obtain this result because it discusses this high-frequency phenomenon in terms of the zero-frequency conductivity. In the case of poorer conductors which do not support plasma oscillations the usual treatment is valid.

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