Vibrational and rotational relaxation of hexafluorobenzene studied by Raman scattering in the supercritical domain

Along the near critical isotherm and in the high compressible domain, local density inhomogeneities are found to have strong influence on both measured shifts and rotational correlation times. A local density excess δρ⁎ = ρloc⁎− ρ⁎ has been featured from these two observables. Furthermore, a very large activation volume was found (800 cm3 mol− 1) which is due to the clustering phenomenon taking place in the hyper-compressible domain.