The increase in amplitude of incident and Raman scattered radiation brought about by the dielectric nature of liquids is known as the internal field effect and is responsible for increasing scattering cross section with increasing refractive index. This effect has been investigated quantitatively by independent measurements of corresponding liquid and gas phase cross sections of 53 Raman bands, or groups of bands, from 14 different organic compounds. Agreement with proposed theory is obtained in most cases, notable exceptions occurring with hydrogen bonded liquids.

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