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Calculations using coupled cluster theory on a 21A\u2032\/31A\u2032 conical intersection in hypofluorous acid illustrate the nonphysical artifacts associated with defects at accidental same-symmetry intersections. In particular, the observed intersection seam is folded about a space of the correct dimensionality, indicating that minor modifications to the theory are required for it to provide a correct description of conical intersections in general. We find that an accidental symmetry allowed 11A\u2033\/21A\u2033 intersection in hydrogen sulfide is properly described, showing no artifacts as well as linearity of the energy gap to first order in the branching plane.<\/jats:p>","DOI":"10.1063\/1.4998724","type":"journal-article","created":{"date-parts":[[2017,10,24]],"date-time":"2017-10-24T11:31:28Z","timestamp":1508844688000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":60,"title":["Crossing conditions in coupled cluster theory"],"prefix":"10.1063","volume":"147","author":[{"given":"Eirik F.","family":"Kj\u00f8nstad","sequence":"first","affiliation":[{"name":"Department of Chemistry, Norwegian University of Science and Technology 1 , 7491 Trondheim, Norway"},{"name":"Department of Chemistry and the PULSE Institute, Stanford University 2 , Stanford, California 94305, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rolf H.","family":"Myhre","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Norwegian University of Science and Technology 1 , 7491 Trondheim, Norway"},{"name":"Department of Chemistry and the PULSE Institute, Stanford University 2 , Stanford, California 94305, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4798-8947","authenticated-orcid":false,"given":"Todd J.","family":"Mart\u00ednez","sequence":"additional","affiliation":[{"name":"Department of Chemistry and the PULSE Institute, Stanford University 2 , Stanford, California 94305, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8367-8727","authenticated-orcid":false,"given":"Henrik","family":"Koch","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Norwegian University of Science and Technology 1 , 7491 Trondheim, Norway"},{"name":"Department of Chemistry and the PULSE Institute, Stanford University 2 , Stanford, California 94305, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2017,10,24]]},"reference":[{"key":"2023061919502312300_c1","doi-asserted-by":"publisher","first-page":"621","DOI":"10.1146\/annurev-physchem-032210-103450","volume":"62","year":"2011","journal-title":"Annu. 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