Local density inhomogeneities detected by Raman scattering in supercritical hexafluorobenzene

Cabaço, M. I.; Besnard, M.; Tassaing, T.; Danten, Y.

doi:10.1351/pac200476010141

Pure Appl. Chem., 2004, Vol. 76, No. 1, pp. 141-146

http://dx.doi.org/10.1351/pac200476010141

Local density inhomogeneities detected by Raman scattering in supercritical hexafluorobenzene

M. I. Cabaço, M. Besnard, T. Tassaing and Y. Danten

Centro de Física da Matéria Condensada UL, Av. Prof. Gama Pinto 2, 1694-003 Lisboa and Departamento de Física, Instituto Superior Técnico, Av. Rovisco Pais 1049-001 Lisboa, Portugal Laboratoire de Physico-Chimie Moléculaire, CNRS (UMR 5803), Université Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex, France

Abstract:

The influence of the local density inhomogeneities in supercritical hexafluorobenzene C₆F₆ has been assessed using Raman spectroscopy.

The polarized and depolarized profiles associated with the "breathing" mode of the molecule has been analyzed for the fluid in a wide density range, namely under isothermal conditions.

The evolution upon the density of the band center position of the isotropic profile along the near-critical isotherm showed an anomalous behavior, characterized by a plateau in the density range (0.6 < ρ* = ρ/ρ_C < 1.3), which is not observed along the isotherm T* ~ 1.11. It has been interpreted as due to the existence of local-density inhomogeneities and the density enhancement factor has been evaluated.

The rotational dynamics of the main symmetry axis of the molecule is governed by a diffusional process. The rotational correlation time τ_2R exhibits an anomalous behavior (plateau regime) for both isotherms.

These findings put in evidence the existence of local density inhomogeneities in a pure fluid and show that Raman spectroscopy is well adapted to investigate these phenomena.