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Møller–Plesset perturbation energies and distances for HeC 20 extrapolated to the complete basis set limit
Author(s) -
Varandas A. J. C.
Publication year - 2009
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.21063
Subject(s) - counterpoise , extrapolation , møller–plesset perturbation theory , basis set , superposition principle , perturbation theory (quantum mechanics) , limit (mathematics) , basis (linear algebra) , statistical physics , perturbation (astronomy) , mathematics , computational chemistry , physics , chemistry , density functional theory , mathematical analysis , quantum mechanics , geometry
The potential energy surface for the C 20 –He interaction is extrapolated for three representative cuts to the complete basis set limit using second‐order Møller–Plesset perturbation calculations with correlation consistent basis sets up to the doubly augmented variety. The results both with and without counterpoise correction show consistency with each other, supporting that extrapolation without such a correction provides a reliable scheme to elude the basis‐set‐superposition error. Converged attributes are obtained for the C 20 – He interaction, which are used to predict the fullerene dimer ones. Time requirements show that the method can be drastically more economical than the counterpoise procedure and even competitive with Kohn‐Sham density functional theory for the title system. © 2008 Wiley Periodicals, Inc. J Comput Chem, 2009