Torheyden, Martin; Jansen, Georg:
Interaction energies for the water dimer by supermolecular methods and symmetry-adapted perturbation theory: the role of bond functions and convergence of basis subsets.
2000
In: Theoretical Chemistry Accounts, Jg. 104 (2000), Heft 5, S. 370 - 384
Artikel/Aufsatz in Zeitschrift2000Chemie
Titel:
Interaction energies for the water dimer by supermolecular methods and symmetry-adapted perturbation theory: the role of bond functions and convergence of basis subsets.
Autor(in):
Torheyden, MartinLSF; Jansen, GeorgLSF
Erscheinungsjahr
2000
Erschienen in:
Titel:
Theoretical Chemistry Accounts
in:
Jg. 104 (2000), Heft 5, S. 370 - 384
ISSN:

Abstract:

Using a systematic series of basis sets in supermol. and symmetry-adapted intermol. perturbation theory calcns. it is examd. how interaction energies of various water dimer structures change upon addn. and shifting of bond functions. Their addn. to augmented double- and triple-zeta basis sets brings the sum of the electron correlation contributions to the second-order interaction energy nearly to convergence, while accurate first-order electrostatic and exchange contributions require better than augmented quadruple-zeta quality. A scheme which combines the different perturbation energy contributions as computed in different basis subsets performs uniformly well for the various dimer structures. It yields a symmetry-adapted perturbation theory value of -21.08 kJ/mol for the energy of interaction of two vibrationally averaged water mols. compared to -21.29 kJ/mol when the full augmented triple-zeta basis set is used throughout.