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dc.contributor.authorChaudhuri, R. K-
dc.contributor.authorFreed, K. F-
dc.contributor.authorHose, G-
dc.contributor.authorPiecuch, P-
dc.contributor.authorKowalski, K-
dc.contributor.authorWloch, M-
dc.contributor.authorChattopadhyay, S-
dc.contributor.authorMukherjee, D-
dc.contributor.authorRolik, Z-
dc.contributor.authorSzabados, A-
dc.contributor.authorTóth, G-
dc.contributor.authorSurján, P. R-
dc.identifier.citationJournal of Chemical Physics, Vol. 122, No. 13, pp. 134105en
dc.description.abstractTests have been made to benchmark and assess the relative accuracies of low-order multireference perturbation theories as compared to coupled cluster (CC) and full configuration interaction (FCI) methods. Test calculations include the ground and some excited states of the Be, H/sub2, BeH/sub2, CH/sub2, and SiH/sub2 systems. Comparisons with FCI and CC calculations show that in most cases the effective valence shell Hamiltonian (H/supv) method is more accurate than other low-order multireference perturbation theories, although none of the perturbative methods is as accurate as the CC approximations. We also briefly discuss some of the basic differences among the multireference perturbation theories considered in this work.en
dc.publisherAmerican Institute of Physicsen
dc.subjectExcited Statesen
dc.subjectPerturbation Theoryen
dc.subjectMany-Body Problemsen
dc.subjectBeryllium Compoundsen
dc.subjectCarbon Compoundsen
dc.subjectSilicon Compoundsen
dc.subjectGround Statesen
dc.subjectOrganic Compoundsen
dc.titleComparison of low-order multireference many-body perturbation theoriesen
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