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Abstract
The Sinanoğlu solvent effect method is here modified to include the exchange-overlap three-body SCF term in addition to the usual triple-dipole term. This is accomplished using an analytical fit which gives a better picture of short range non-additive interactions. The application of this modified model to the dimers (4He)2, (3He)2 and 3He-4He in a liquid 4He environment leads to the lowering of the effective-pair potential energy curve. As a consequence the new terms play a significant role, within the limitations of the method, in the calculation of a bound state of helium dimers immersed in a liquid helium medium.