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The problem of calculation of electromagnetic field energy outside thetransparency domain is discussed. It is shown that charged particlecontribution to the energy of electromagnetic perturbations in the general casecan be described in terms of bilinear combination of the dielectricpolarizability of the medium. The explicit form of such contribution is found.The relations obtained are used to generalize the Planck's law to the case ofabsorptive medium.

To the Problem of Electromagnetic Field Energy in the Medium with Temporal and Spatial Dispersion Outside the Transparency Domain