Acoustic investigations of liquids (C8F16 and C9F18) at the various thermodynamic conditions

Abstract

The fluorocarbons liquids are studied by acoustical method and Brillouin scattering in temperature range from 273 to 313 K and pressure from 0.1 to 50 MPa. Acoustical relaxation in liquid C8F16 with relaxation time of order 10-10 s is discovered. This acoustical relaxation has been analyzed under an assumption of a single vibration relaxation. The measurement of hypersonic velocity by means of Mandelshtam-Brillouin light scattering under high pressure was conducted within two angles of light scattering.