Abstract
A mechanism is proposed to account for the second dispersion region which occurs in polar liquids at frequencies higher than the Debye frequency. This mechanism is a vibration of the molecules about temporary equilibrium positions which are determined by the arrangement of the neighbours. It leads to a value of the high frequency limit, ∞, of the Cole-Cole arc for the Debye dispersion given by (∞ - n2)/(0 - n2) = 2kT/Iω02, where ω0 is the resonant frequency of the vibration, n is the optical refractive index and I is the mean moment of inertia of the molecules about axes normal to the dipole axis, but provided ω0 >> 1/τ, where τ is the dielectric relaxation time, it does not modify the semicircular form of the arc.
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