Light scattering in liquids

The theory of light scattering is discussed with special reference to the following points: Comparison between coherent and incoherent scattering, variation of intensity with frequency of exciting light, nature of frequency shifts, and loca- tion of energy levels which play a role.An efficient experimental arrangement for investigating the spectra of mercury arc light scattered by liquids is described in detail, and numerical data are given for the modified lines observed for benzene (C 6 H 6), toluene (C 6 H 5 CH 3 ), chloro- form (CHCI3), and carbon tetrachloride (CGI4).From the wave numbers of the modified and unmodified lines the frequency shifts (cm -1 ) characteristic of the liquids are determined as follows: (C6H 6 ) 605.7, 848.6, 992.