Evidence of Anomalous Acoustic Behavior from Brillouin Scattering in Supercooled Water

Abstract

Brillouin scattering spectra in water both in the normal and in the metastable (supercooled) regions are investigated. The experimenal data are extended for the first time in a bulk sample down to -27.0\ifmmode^\circ\else\textdegree\fi{}C. A refined analysis method allows the authors to obtain hypersonic absorption and velocity. The data are briefly analyzed in the frame of both a relaxation process and a heterophase-fluctuation hypothesis.