Some studies of the spectra of thermal and stimulated molecular scattering of light.

This paper gives the results of a study of the spectraof thermal and stimulated molecular light scattering in various media. The velocity and absorption of hypersound in liquids were measured. The indicatrix of the spectrum of thermal scattering in the wing of the Rayleigh line was studied in a number of liquids. A new phenomenon is described-the fine structure in the spectrum in the thermal wing of the Rayleigh line in liquids. A theory is developed of the induced scattering of light in the wing of the Rayleigh line; the results of the observation of this phenomenon in a number of liquids as well as the results of the investigation of its temperature dependence are presented. Results of the study of stimulated Mandelstam-Brillouin scattering in compressed gases, liquids, glasses, and in a quartz crystal, are presented. A Mandelstam-Brillouin phonon generator has been obtained under conditions where the quartz single crystal could not be damaged under the influence of a giant laser pulse. The experimental and theoretical studies in the area of molecular scattering of light in many countries are so extensive that the authors were forced to confine themselves to a presentation of only a part of their work.