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Gauging the performance of some density functionals including dispersion and nonlocal corrections for relative energies of water 20-mers.

Identifieur interne : 000C96 ( PubMed/Checkpoint ); précédent : 000C95; suivant : 000C97

Gauging the performance of some density functionals including dispersion and nonlocal corrections for relative energies of water 20-mers.

Auteurs : Mojtaba Alipour [Iran]

Source :

RBID : pubmed:28570983

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English descriptors

Abstract

Currently, development of density functional theory approximations and their benchmarking for accurately modeling different types of molecular interactions become a very active field of research. In this report, performance of the dispersion (D3) and nonlocal (NL) corrected density functionals has been compared with generalized energy-based fragmentation approach at the complete basis set limit for predicting the relative energies of 10 low-energy isomers of water nanoclusters (H2O)20 as an illustrative example of hydrogen bonded systems. Considering a variety of exchange-correlation density functionals in combination with D3 and NL corrections we find that the D3 based approximations outperform the functionals incorporating NL correction. It is also shown that the LC-ωPBE-D3 and rPW86PBE-NL functionals have the best trend from the viewpoint of the order of stabilities in water nanoclusters under study.

DOI: 10.1016/j.jmgm.2017.05.006
PubMed: 28570983


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pubmed:28570983

Le document en format XML

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