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Scattering is produced by acoustic phonons that generate pressure waves which frequency shift is determined by the acoustic velocity in the medium. The physical process behind this effect, called electrostriction phenomenon, is the tendency of materials to become compressed in the presence of an electric field. It is an inelastic phenomenon lead to two spectral lines with two symmetrical frequencies: Stokes frequency and Anti-Stokes frequency.
Contributor: Antoine Bassil (ESR2)