DISPERSION OF POLARIZABILITY ANISOTROPY OF H-2, O-2, N2O, CO2, NH3, C2H6, AND CYCLO-C3H6 AND EVALUATION OF ISOTROPIC AND ANISOTROPIC DISPERSION-INTERACTION ENERGY COEFFICIENTS

Polarizability anisotropies kappa(omega) in the W frequency range are deduced from a detailed analysis of mean polarizabilities alpha(omega) and Rayleigh scattering depolarization ratios rho(omega). As rho(omeg a) is in general only known for frequencies up to 0.1 au (457 nm), the quantum mechanically known relationship between alpha(omega) and kapp a(omega) is used in order to extrapolate kappa(omega) to 0.2 au (228 n m). The first results of kappa(omega) in the W frequency range are pre sented and discussed for N2O, CO2, NH3, C2H6, and cyclo-C3H6. The obta ined frequency dependence of the polarizability and its anisotropy is used to calculate isotropic as well. as anisotropic dispersion-interac tion energy coefficients.