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Like Hartree-Fock, our approach is deterministic, state-specific, applies a variational principle to a minimally correlated ansatz, produces energy stationary points, relaxes the orbital basis, has a Fock-build cost-scaling, and can serve as the foundation for correlation methods such as perturbation theory and coupled cluster theory. To emphasize this last point, we pair our mean field approach with an excited state analog of second order M\u00f8ller-Plesset theory and demonstrate that in water, formaldehyde, neon, and stretched lithium fluoride, the resulting accuracy far exceeds that of configuration interaction singles and rivals that of equation of motion coupled cluster.<\/jats:p>","DOI":"10.1063\/1.5045056","type":"journal-article","created":{"date-parts":[[2018,8,22]],"date-time":"2018-08-22T14:57:43Z","timestamp":1534949863000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":66,"title":["Communication: A mean field platform for excited state quantum chemistry"],"prefix":"10.1063","volume":"149","author":[{"given":"Jacqueline A. 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