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Second-Order Exchange-Dispersion Energy Based on a Multireference Description of Monomers

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dc.abstract.enWe present a method for calculation of the second-order exchange-dispersion energy in the framework of the symmetry-adapted perturbation theory (SAPT) for weakly interacting monomers described with multiconfigurational wave functions. The proposed formalism is based on response properties obtained from extended random phase approximation (ERPA) equations and assumes the single-exchange (S2) approximation. The approach is applicable to closed shell systems where static correlation cannot be neglected or to systems in nondegenerate excited states. We examine the new method in combination with either generalized valence bond perfect pairing (GVB) or complete active space self-consistent field (CASSCF) description of the interacting monomers. For model multireference dimers in ground states (H2···H2, Be···Be, He···H2), exchange-dispersion energies are reproduced accurately. For the interaction between the excited hydrogen molecule and the h elium atom we found unacceptably large errors which is attributed to the neglect of diagonal double excitations in the employed approximation to the linear response function.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorHapka, Michał
dc.contributor.authorPernal, Katarzyna
dc.contributor.authorPrzybytek, Michał
dc.date.accessioned2024-01-26T05:38:56Z
dc.date.available2024-01-26T05:38:56Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.number12
dc.description.volume15
dc.identifier.doi10.1021/ACS.JCTC.9B00925
dc.identifier.issn1549-9618
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/119493
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Chemical Theory and Computation
dc.relation.pages6712-6723
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleSecond-Order Exchange-Dispersion Energy Based on a Multireference Description of Monomers
dc.typeJournalArticle
dspace.entity.typePublication