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Nevertheless, some aspects still remain elusive. The effects of Jahn\u2013Teller and pseudo-Jahn\u2013Teller interactions on the quantum dynamics of NO3 have been studied extensively, but the influence of spin\u2013orbit (SO) coupling has received little attention. The present work aims to fill this gap. A recently developed diabatic potential energy model [F. Fritsch and W. Eisfeld, J. Chem. Phys. 164, 074107 (2026)] is used to study the influence of SO coupling on the quantum dynamics. First, the impact on the nonadiabatic population dynamics following excitation to the B\u03032E\u2032 state of NO3 is explored. This excitation, relevant for the photodetachment of NO3\u2212 and photodissociation of NO3, is complemented by a comparison with the impact of NO3\u2212 vibrational pre-excitation. The latter turned out to have a much more pronounced effect than SO coupling. Second, the vibronic eigenstates of the B\u03032E\u2032 state are examined, which reveal the more subtle effects of SO coupling. The experimentally observed splitting of the 0\u20130 B\u03032E\u2032 \u2190 X\u03032A2\u2032 transition is reproduced accurately, and additional insight into the spin-vibronic structure of the B\u03032E\u2032 state is provided and discussed in detail.<\/jats:p>","DOI":"10.1063\/5.0347370","type":"journal-article","created":{"date-parts":[[2026,8,11]],"date-time":"2026-08-11T12:20:25Z","timestamp":1786450825000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Effects of spin\u2013orbit coupling on the quantum dynamics and vibronic structure of the B\u03032E\u2032 state of NO3"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0843-4028","authenticated-orcid":false,"given":"Fabian","family":"Fritsch","sequence":"first","affiliation":[{"name":"Theoretische Chemie, Universit\u00e4t Bielefeld 1 , Postfach 100131, D-33501 Bielefeld,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2520-7502","authenticated-orcid":false,"given":"Alexandra","family":"Viel","sequence":"additional","affiliation":[{"name":"Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)\u2013UMR 6251 2 , F-35000 Rennes,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3691-730X","authenticated-orcid":false,"given":"Wolfgang","family":"Eisfeld","sequence":"additional","affiliation":[{"name":"Theoretische Chemie, Universit\u00e4t Bielefeld 1 , Postfach 100131, D-33501 Bielefeld,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,8,11]]},"reference":[{"key":"2026081107480721300_c1","doi-asserted-by":"publisher","first-page":"899","DOI":"10.1063\/1.466572","volume":"100","year":"1994","journal-title":"J.\u00a0Chem. 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