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Combining concepts from each of these fields, there is now an opportunity to create and manipulate photonic matter via strong coupling of molecules to the electromagnetic field. Toward this goal, here we demonstrate a first principles framework to calculate polaritonic excited-state potential-energy surfaces, transition dipole moments, and transition densities for strongly coupled light\u2013matter systems. In particular, we demonstrate the applicability of our methodology by calculating the polaritonic excited-state manifold of a formaldehyde molecule strongly coupled to an optical cavity. This proof-of-concept calculation shows how strong coupling can be exploited to alter photochemical reaction pathways by influencing avoided crossings with tuning of the cavity frequency and coupling strength. Therefore, by introducing an ab initio method to calculate excited-state potential-energy surfaces, our work opens a new avenue for the field of polaritonic chemistry.<\/jats:p>","DOI":"10.1063\/5.0021033","type":"journal-article","created":{"date-parts":[[2020,9,4]],"date-time":"2020-09-04T06:59:32Z","timestamp":1599202772000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":70,"title":["<i>Ab initio<\/i>\n                    polaritonic potential-energy surfaces for excited-state nanophotonics and polaritonic chemistry"],"prefix":"10.1063","volume":"153","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0273-7797","authenticated-orcid":false,"given":"Johannes","family":"Flick","sequence":"first","affiliation":[{"name":"John A. 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