Abstract
The second order BSSE-free intermolecular perturbation theory based on the ‘Chemical Hamiltonian Approach’ (CHA), which was developed in the first part of this paper is applied to several hydrogen bonded systems using a variety of different basis sets. The results show that the second order BSSE-free interaction energy is remarkably close to that obtained by the conventional MP2 interaction energy if the latter is properly CP corrected. This shows that these two independent and conceptually different approaches–the classical Boys-Bernardi scheme and the CHA method–strongly corroborate each other.
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