Polarizability of a pair of hydrogen molecules

The interaction polarizability of two hydrogen molecules is calculated by the ab initio method of Bounds, D. G., 1976, Molec. Phys., 38, 2099 in terms of spherical coordinates. A good representation is obtained for the anisotropy, using six coefficients in the expansion, while no satisfactory results are obtained for the isotropic part. A comparison with experimental collision-induced light scattering spectral moments and with the recently measured intensity of the double rotational transition is made, and the results discussed in detail.