Abstract
ABSTRACT In this review an independent method of vibrational spectroscopy, the spectroscopy of hyper.. Raman scattering, is presented. The method was essentially developed and applied to study a number of physical problems. Some new possibilities for the study of material properties are demonstrated.This method is useful for the investigation of centrosymmetric and noncentrosymmetric crystals, glasses, liquids and gases at any conditions and under various external actions. 2.INTRODUCTION The discovery of nonlinear optical effects has essentially enriched the spectroscopy of scatteredlight. The stimulated Raman scattering (SRS), coherent anti-Stokes (Stokes) Raman spectroscopy (CARS) and hyper-Raman scattering (HRS) are of important significance for the vibrational spectroscopy. Applications of these techniques in analytical spectroscopy were discussed in several reviews (SRS 1, ARS2 and HRS 36). HRS is a three.photon process in which a system is excited with two photons of frequency co
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