Two different forms have been proposed for the relation between the frequency-dependent dielectric constant of a polar substance and the autocorrelation function for the net dipole moment of a small spheriCal region inside the dielectric. We find that one of them is correct, while the other one describes a spherical sample embedded in a medium with a frequency-independent dielectric constant equal to the static dielectric constant of the sample. A number of recent papers dealing with this question are analyze…
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