Light scattering data analysis via set inversion

Set inversion is applied to recent collision-induced scattering data concerning gaseous . It makes it possible to approximate the set of all vectors of independent components of the dipole - quadrupole and dipole - octopole polarizability tensors. Numerical analysis shows that short-range effects must be taken into account in the high-frequency range of each dipole - multipole contribution to the CIS isotropic spectrum of . It also demonstrates the agreement between experiment and recent ab initio calculations.