Discrimination between conduction and polarization processes in an ac electric field

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Abstract
A comprehensive description of the current response of any medium to an ac electric field can be made by using complex notations for conduction and polarization terms in the Maxwell equation and by discriminating each of them. Our formalism was applied to complex admittance Y*(=G−jB) of a glass and to several optical properties of metals. For the former, it was found that the conductance G is the sum of contributions from dc conduction and the dielectric loss factor while the susceptance B is due to the dielectric constant. By specifying each contribution to the observed admittance, the origin of ac conductivity in glass was clarified more profoundly. For the latter, the optical properties of metals can be dealt with more precisely by discriminating contributions from the conduction by free electrons and from the polarization by bound electrons.