Knowledge Bank

Using correlation consistent basis sets and advanced methods for treating electron correlation, it is possible to compute the equilibrium properties ($De,re$, etc.) of weakly bound complexes to accuracies of a few wavenumbers and a few milli{\AA}ngstroms. We discuss the application of these techniques to selected prototypical systems, namely Ar-HX (X=F, Cl) and $N2-HF$. Calculation of an extended potential energy surface should allow the detailed prediction of the vibrational states of these complexes.