  Symmetry Adapted Perturbation Theory (SAPT) has become an important tool when
predicting and analyzing intermolecular interactions. Unfortunately, DFT-SAPT,
which uses Density Functional Theory (DFT) for the underlying monomers, has
some arbitrariness concerning the exchange-correlation potential and the
exchange-correlation kernel involved. By using ab initio Brueckner Doubles
densities and constructing Kohn-Sham orbitals via the Zhao-Morrison-Parr (ZMP)
method, we are able to lift the dependence of DFT-SAPT on DFT
exchange-correlation potential models in first order. This way, we can compute
the monomers at the Coupled-Cluster level of theory and utilize SAPT for the
intermolecular interaction energy. The resulting ZMP-SAPT approach is tested
for small dimer systems involving rare gas atoms, cations, and anions and shown
to compare well with the Tang-Toennies model and coupled cluster results.
