Coupled-cluster calculation of dispersion contributions to interaction energies and polarizabilities

The induced dipole dispersion-type contributions to the two-body and nonadd itive three-body energies and electric dipole polarizabilities are studied for long-range interactions involving the He, Ne, Ar and Kr atoms and the H -2 and N-2 molecules. The coupled-cluster singles and doubles model and lar ge basis sets are used. Comparison of the energy contributions with data de rived from experiment shows in most cases the deviations to be less than 1% ; therefore, it may be expected that the calculated polarizability incremen ts are accurately determined and can be used to estimate the accuracy of ap proximate methods.