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Perturbative ab initio calculations of intermolecular energies. III. The water dimer

✍ Scribed by J. P. Daudey

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
737 KB
Volume
8
Category
Article
ISSN
0020-7608

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✦ Synopsis

Abstract

The interaction energy between two water molecules A and B is calculated by the method described in Paper I [1], previously applied for the interaction between two helium atoms (Paper II) [2]. This interaction energy is obtained as the difference between the energies of the complex (A + B) and the monomers (A) and (B), obtained by a perturbation method. The results obtained with the perturbation developed up to the second order in a minimal atomic basis set are decomposed into classical contributions and contributions linked to the exchange possibility. Charge transfer contributions are important and the localized character of the hydrogen bond is examined. It is pointed out that the definition of the set of excited configurations for the calculation of the energies of the isolated monomers is important, especially when one tries to use a small atomic basis set. A similar effect in SCF‐type calculations is evaluated. The contribution of higher orders is evaluated by the CIPSI method.

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SCF MO LCAO ab tnttio computations were carried out for 165 contigurattons of the acetomtrde dimer and the cd-c&ted interaction cnergtcs were fitted by an analyttcal potcnttal consisting of a 6-12 Lcnnard-Jones term plus a coulombic term. The configurations correspondtng to the energy mtntma fit quo