THE SPECTRA OF MOLECULAR LIGHT-SCATTERING AND SOME OF THEIR APPLICATIONS

Some aspects of the theory of light scattering by various kinds of opt ical inhomogeneties are discussed. Examples are given of applications of spectroscopy to the propagation of hypersound in various media, and under different conditions, including the critical region at phase tr ansitions; magnon spectra in antiferromagnetics; Mandel'stam-Brillouin (MB) piezoelectric spectra in semiconductors in a static electric fie ld; the phonon 'bottleneck'; MB spectra under the conditions of a stat ionary temperature gradient; fine structure of the Rayleigh wing; prop agation of transverse hypersound in a medium whose shear viscosity var ies in a wide range, and some other problems.