Brillouin scattering in liquids at 4880Å

An argon ion laser has been used as a source of 4880Å radiation to study Brillouin scattering in liquids. Hypersonic velocities were measured in benzene, carbon disulfide, carbon tetrachloride, chloroform, methylene chloride, methylene iodide, toluene, and water at a scattering angle of 89° 45´. The width of the Brillouin line for monochromatic excitation was found to be approximately 0.007 cm^-1in toluene and 0.011 cm^-1in methylene chloride. However, line broadening in benzene, carbon disulfide, chloroform, and methylene chloride was found to be less than 0.002 cm^-1. Depolarization factors of the Brillouin lines were measured in carbon disulfide, benzene, and toluene. The wing structure of the Rayleigh lines and depolarization of the Rayleigh wings were also measured in benzene, carbon disulfide, and toluene. Widths of the Rayleigh wings were approximately 6.8 cm^-1in benzene, 6.7 cm^-1in carbon disulfide, and 8.5 cm^-1in toluene. From measurements of Brillouin scattering intensity, approximate values of the electrostrictive coupling constants of the other seven liquids were calculated relative to those of carbon disulfide.