ABSTRACT
Raman scattering is a process involving the scattering of light a material occurring simultaneously with the absorption or emission of thermal energy (phonons) . Conservation of energy requires that the energy of the scattered photon be different from that of the incident photon by an amount equal to the energy of the phonon that is absorbed or emitted. The two Indian scientists who first observed Raman scattering, c.v. Raman and K.S . Krishnan, were doing light scattering experiments on molecular liquids and vapors. The two Russian scientists who simultaneously observed the same effect. G .S . Landsberg and L.I . Mandelshtam, were investigating light scattering in crystals . Since then Raman light scattering has also been observed in many types of gases.
