Perturber dependence of the collision-induced light scattering by SF₆ and CF₄

Abstract

The two-body collision-induced light scattering spectra of pure SF₆ and CF₄ and of their mixtures with inert gases have been measured at 295K. The data were compared with calculations of the spectral profiles. These comparisons enabled: (i) the testing of a scaling law for the pair polarizability anisotropy responsible for the purely translational scattering; (ii) the determination of refined values for the magnitudes of the dipole-octopole polarizability ((10·7 ± 2) × 10^-50 m⁵) of SF₆ and of the dipole-quadrupole ((2·5 ± 0·3) × 10^-40 m⁴) and dipole-octople ((2·5 ± 0·3) × 10^-50 m⁵) polarizabilities of CF₄; and (iii) the assessment of the suitability of available intermolecular potentials for describing the interaction leading to the scattering, particularly for SF₆-SF₆, SF₆-Kr and CF₄-Ar.