About: Basis Set Dependence of Interaction Energies Computed Using Composite Post-MP2 Methods

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Description	We report the performance of composite post-MP2 ab initio methods with small basis sets for description of noncovalent interactions, using the S66 data set as a benchmark. For three representative complexes, it is shown that explicitly correlated coupled cluster (CCSD-F12a) methods yield interaction energies ca. 0.1 kcal/mol from the complete basis set limit with aug-cc-pVDZ. Triple excitations are not explicitly correlated in this approach, but we show that scaling the perturbative triples via the (T) approximation improves agreement with benchmark values. Across the entire S66 data set, this approach results in a root-mean-square error (RMSE) of 0.13 kcal/mol or 3%, with well-balanced description of all classes of complex. The basis set dependence of traditional CCSD(T) interaction energies is examined, and the small 6-31G(0.25) basis set is found to give particularly accurate results (RMSE = 0.15 kcal/mol, or 4%). We also employ spin component scaling (SCS) of CCSD-F12a data, which gives slightly better accuracy than CCSD(T)-F12a if contributions from same- and opposite-spin pairs are optimized for this data set (RMSE = 0.08 kcal/mol, or 2%). Interpolation of local MP2 and MP3 is also shown to accurately reproduce benchmark data with both aug-cc-pVDZ (RMSE = 0.18 kcal/mol or 5%) and 6-31G(0.25) (RMSE = 0.13 kcal/mol or 4%). We report the performance of composite post-MP2 ab initio methods with small basis sets for description of noncovalent interactions, using the S66 data set as a benchmark. For three representative complexes, it is shown that explicitly correlated coupled cluster (CCSD-F12a) methods yield interaction energies ca. 0.1 kcal/mol from the complete basis set limit with aug-cc-pVDZ. Triple excitations are not explicitly correlated in this approach, but we show that scaling the perturbative triples via the (T) approximation improves agreement with benchmark values. Across the entire S66 data set, this approach results in a root-mean-square error (RMSE) of 0.13 kcal/mol or 3%, with well-balanced description of all classes of complex. The basis set dependence of traditional CCSD(T) interaction energies is examined, and the small 6-31G(0.25) basis set is found to give particularly accurate results (RMSE = 0.15 kcal/mol, or 4%). We also employ spin component scaling (SCS) of CCSD-F12a data, which gives slightly better accuracy than CCSD(T)-F12a if contributions from same- and opposite-spin pairs are optimized for this data set (RMSE = 0.08 kcal/mol, or 2%). Interpolation of local MP2 and MP3 is also shown to accurately reproduce benchmark data with both aug-cc-pVDZ (RMSE = 0.18 kcal/mol or 5%) and 6-31G(0.25) (RMSE = 0.13 kcal/mol or 4%). (en)
Title	Basis Set Dependence of Interaction Energies Computed Using Composite Post-MP2 Methods Basis Set Dependence of Interaction Energies Computed Using Composite Post-MP2 Methods (en)
skos:prefLabel	Basis Set Dependence of Interaction Energies Computed Using Composite Post-MP2 Methods Basis Set Dependence of Interaction Energies Computed Using Composite Post-MP2 Methods (en)
skos:notation	RIV/61388963:_____/13:00392240!RIV14-GA0-61388963
http://linked.open...avai/predkladatel	Ústav organické chemie a biochemie AV ČR, v. v. i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GBP208/12/G016)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Řezáč, Jan Hobza, Pavel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav organické chemie a biochemie AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	62954
http://linked.open...ai/riv/idVysledku	RIV/61388963:_____/13:00392240
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	plesset perturbation-theory; intermolecular interaction energies; density fitting approximations (en)
http://linked.open.../riv/klicoveSlovo	density fitting approximations plesset perturbation-theory intermolecular interaction energies
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[D3D611975B74]
http://linked.open...i/riv/nazevZdroje	Journal of Chemical Theory and Computation
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Controlling structure and function of biomolecules at the molecular scale: theory meets experiment
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	9
http://linked.open...iv/tvurceVysledku	Hobza, Pavel Řezáč, Jan Riley, K. E. Hill, J. G. Platts, J. A.
http://linked.open...ain/vavai/riv/wos	000313378700037
issn	1549-9618
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1021/ct300842d

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