Abstract
Measurement of dielectric relaxation in liquids has verified the general theory of Debye for the effects of rotational diffusion on the orientational contribution in the low frequency limit. However, at high frequencies (frequerscies above the inverse mean collision time), relaxation effects are more complicated, and certainly interaction-induced effects and the effects of rotational inertia must be included.1 This has led to the recent exciting time domain demonstration of inertial effects in the transient response.2 Even in the Debye limit, theory shows the importance of inertial effects.3 Frequency domain measurements have shown subpicosecond relaxation using four-wave mixing (FWM),4 although the bandwidth of these measurements did not extend to the limit where more complicated relaxation phenomena would dominate the spectrum.
© 1989 Optical Society of America
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