{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,28]],"date-time":"2026-01-28T00:05:04Z","timestamp":1769558704171,"version":"3.49.0"},"reference-count":93,"publisher":"AIP Publishing","issue":"13","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2005,4,1]]},"abstract":"<jats:p>Tests 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, H2,BeH2,CH2, and SiH2 systems. Comparisons with FCI and CC calculations show that in most cases the effective valence shell Hamiltonian (Hv) 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.<\/jats:p>","DOI":"10.1063\/1.1863912","type":"journal-article","created":{"date-parts":[[2005,4,1]],"date-time":"2005-04-01T23:06:19Z","timestamp":1112396779000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":62,"title":["Comparison of low-order multireference many-body perturbation theories"],"prefix":"10.1063","volume":"122","author":[{"given":"Rajat K.","family":"Chaudhuri","sequence":"first","affiliation":[{"name":"Department of Chemistry, The James Franck Institute , University of Chicago, Chicago, Illinois 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karl F.","family":"Freed","sequence":"additional","affiliation":[{"name":"Department of Chemistry, The James Franck Institute , University of Chicago, Chicago, Illinois 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriel","family":"Hose","sequence":"additional","affiliation":[{"name":"Department of Chemistry, The James Franck Institute , University of Chicago, Chicago, Illinois 60637"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Piotr","family":"Piecuch","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Michigan State University , Michigan 48824"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karol","family":"Kowalski","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Michigan State University , Michigan 48824"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marta","family":"W\u0142och","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Michigan State University , Michigan 48824"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sudip","family":"Chattopadhyay","sequence":"additional","affiliation":[{"name":"Indian Association for the Cultivation of Science , Kolkata 700032, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Debashis","family":"Mukherjee","sequence":"additional","affiliation":[{"name":"Indian Association for the Cultivation of Science , Kolkata 700032, India"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zolt\u00e1n","family":"Rolik","sequence":"additional","affiliation":[{"name":"Department of Theoretical Chemistry, E\u00f6tv\u00f6s University , H-1518, P.O. 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