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The definition of a complex Kerr constant follows from the description of the interaction of light with molecules in an electrostatic field. The treatment is based on the time-dependent perturbation theory, assuming a quasi continuum of librational states of the molecules concerned.

Die Dispersion des Kerr-Effektes. V.: Zur Theorie der Kramers-Kronig-Relation zwischen dem Kerr-Effekt und der Elektrochromie