THEORY OF RAYLEIGH AND BRILLOUIN SCATTERING NEAR THE PHASE TRANSITION

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Abstract
After giving a basic outline of the theory of light scattering and mentioning a few results for the case of a simple monoatomic liquid at the liquid-gas transition, the spectrum of light scattered from acoustic modes is discussed with special emphasis on the coupling of the acoustic mode to the soft optical mode. A theory of a central component in the light scattering spectrum is outlined. This quasi-elastic peak arises from phonon density fluctuations and in general should be observed through anharmonic coupling to the soft mode and through direct coupling of light to this collective excitation

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