Binary collision-induced light scattering by isotropic molecular gases

The two-body collision-induced scattering spectra of CH4, CD4, CF4 and SF6 are presented. They are shown to contain features due to collision-induced rotational Raman scattering (CIRS). The spectra are used to obtain estimates of the magnitude of the molecular polarizabilities A (dipole-quadrupole) and E (dipole-octopole). The zeroth moment of the translational CIS spectrum also provides further evidence that the pair polarizability β(r) may be accurately described by the point dipole-induced-dipole (DID) model with small dispersion corrections.