Journal
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
Volume 122, Issue 8, Pages -Publisher
WILEY
DOI: 10.1002/qua.26777
Keywords
basis set superposition error; chemical Hamiltonian approach; water dimer
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The study introduces a new method based on the chemical Hamiltonian approach, which reduces basis set superposition error. Comparing with previous methods, it shows a significant simplification, but performs poorly with the aug-cc-pVDZ basis set.
We present an alternative perturbational approach free of basis set superposition error (BSSE) within the framework of the chemical Hamiltonian approach (CHA). The new formulation (CHA-S-MP2) is based on canonic (and orthogonal) CHA orbitals obtained from a hermitized CHA Fock operator. The final expression shows a considerable simplification of the method as compared to the previous CHA-MP2 formalism. Numerical full geometry optimizations of water and hydrogen fluoride dimers and potential energy surfaces for helium and argon dimers for several basis sets are presented. The present method is compared to both the counterpoise and previous CHA-MP2 BSSE correction schemes, showing a remarkable agreement between all three methods. However, the wrong behavior using the aug-cc-pVDZ basis set indicates that the present method is not as robust as the original non-hermitian CHA-MP2 formulation.
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