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Explicitly correlated local coupled‐cluster methods using pair natural orbitals
Author(s) -
Ma Qianli,
Werner HansJoachim
Publication year - 2018
Publication title -
wiley interdisciplinary reviews: computational molecular science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.126
H-Index - 81
eISSN - 1759-0884
pISSN - 1759-0876
DOI - 10.1002/wcms.1371
Subject(s) - coupled cluster , atomic orbital , electronic structure , basis set , ab initio , cluster (spacecraft) , convergence (economics) , basis (linear algebra) , computer science , quantum chemistry , set (abstract data type) , statistical physics , algorithm , density functional theory , computational chemistry , chemistry , mathematics , physics , quantum mechanics , molecule , geometry , supramolecular chemistry , economics , programming language , economic growth , electron
Recently developed explicitly correlated local coupled‐cluster methods [PNO‐LCCSD(T)‐F12] are reviewed. Extensive benchmarks for reaction energies and intermolecular interaction energies are presented, in which the convergence of the results with respect to all local approximations is studied. The explicit correlation treatment (F12) is shown to be essential to minimize basis set incompleteness errors, as well as errors caused by domain approximations. Generally, the errors of relative energies due to local approximations can be reduced to below 1 kcal/mol. The methods are well parallelized, and using small computer clusters with 100–200 computing cores, calculations for systems with 100–200 atoms using augmented triple‐ ζ basis sets can be carried out within a few hours of elapsed time. Recommendations are made on how such calculations should be carried out, how the accuracy can be tested, and which computational resources are required. This article is categorized under: Electronic Structure Theory> Ab Initio Electronic Structure Methods Software> Quantum Chemistry