Journal
CHEMICAL PHYSICS LETTERS
Volume 422, Issue 4-6, Pages 345-349Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2006.02.086
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Basis set superposition error (BSSE) in density-functional calculations occurs when the extended Kohn-Sham orbitals are expanded in localised basis sets. but is absent when a plane-wave basis is used. Elimination of BSSE is essential for the accurate description of intermolecular forces. Linear-scaling methods are formulated in terms of local orbitals, making plane-waves an inappropriate choice of basis. In this work the BSSE in linear-scaling methods is studied in the context of hydrogen bonds. In particular it is shown that BSSE is eliminated by optimizing the local orbitals in situ using a systematic basis set equivalent to a set of plane-waves. (c) 2006 Elsevier B.V. All rights reserved.
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