Direct Sum-of-States Calculations of the Frequency-Dependent Polarizability ofH2

The direct sum-over-states method of calculation of dynamic polarizabilities is used to compute the most accurate values for the frequency-dependent polarizability of the ground state yet obtained by ab initio calculations. Accurate values of Rayleigh depolarization ratios are also obtained. A Rayleigh depolarization ratio for Lyman-$\alpha$ radiation (unpolarized light) of 0.0562 is obtained. The feasibility of direct computation of the electric dipole components of the resolvent operator for molecules is established.