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While the excited state dynamics of cyclobutanone after \u03c0* \u2190 n excitation into the lowest-energy excited singlet (S1) state has been extensively studied, the dynamics following 3s \u2190 n excitation into the higher-lying singlet Rydberg (S2) state are less well understood. Herein, we employ fully quantum multiconfigurational time-dependent Hartree (MCTDH) simulations using a model Hamiltonian as well as \u201con-the-fly\u201d trajectory-based surface-hopping dynamics (TSHD) simulations to study the relaxation dynamics of cyclobutanone following 3s \u2190 n excitation and to predict the ultrafast electron diffraction scattering signature of these relaxation dynamics. Our MCTDH and TSHD simulations indicate that relaxation from the initially-populated singlet Rydberg (S2) state occurs on the timescale of a few hundreds of femtoseconds to a picosecond, consistent with the symmetry-forbidden nature of the state-to-state transition involved. There is no obvious involvement of excited triplet states within the timeframe of our simulations (&amp;lt;2\u00a0ps). After non-radiative relaxation to the electronic ground state (S0), vibrationally hot cyclobutanone has sufficient internal energy to form multiple fragmented products including C2H4 + CH2CO (C2; 20%) and C3H6 + CO (C3; 2.5%). We discuss the limitations of our MCTDH and TSHD simulations, how these may influence the excited state dynamics we observe, and\u2014ultimately\u2014the predictive power of the simulated experimental observable.<\/jats:p>","DOI":"10.1063\/5.0203597","type":"journal-article","created":{"date-parts":[[2024,4,15]],"date-time":"2024-04-15T13:23:06Z","timestamp":1713187386000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["The photochemistry of Rydberg-excited cyclobutanone: Photoinduced processes and ground state dynamics"],"prefix":"10.1063","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7118-7242","authenticated-orcid":false,"given":"J.","family":"Eng","sequence":"first","affiliation":[{"name":"Chemistry, School of Natural and Environmental Sciences, Newcastle University 1 , Newcastle Upon Tyne NE1 7RU, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7104-847X","authenticated-orcid":false,"given":"C. D.","family":"Rankine","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of York 2 , York YO10 5DD, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4490-5672","authenticated-orcid":false,"given":"T. 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