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In this work pyridine N\u2010oxide and pyridazine N\u2010oxide are studied using steady\u2010state and time\u2010resolved X\u2010ray absorption spectroscopy (XAS). Absorption changes at the nitrogen and oxygen K\u2010edges following UV photoexcitation are recorded on a timescale of picoseconds to hundreds of nanoseconds. The spectral features are assigned to the presence of specific transient intermediates. Quantum chemical calculations indicate that the excited state dynamics in the S\n                    <jats:sub>1<\/jats:sub>\n                    state are characterized by a fast deplanarization. After reaching a minimum energy crossing point (MECP), evolution on the ground state surface leads to the starting materials and metastable products. The primary photoproduct of pyridine N\u2010oxide, oxaziridine\n                    <jats:bold>3<\/jats:bold>\n                    , is stable on the sub\u2010microsecond timescale. In the photochemistry of pyridazine N\u2010oxide, oxaziridine and oxadiazepine intermediates are not observed, and (\n                    <jats:italic>Z<\/jats:italic>\n                    )\u20104\u2010diazobut\u20102\u2010enal is formed within 100\u00a0ps. The mechanistic details of the two different N\u2010oxides uncovered through characteristic features in the near\u2010edge X\u2010ray absorption fine structure (NEXAFS) region serve as an example of how time\u2010resolved XAS enables the characterization of photochemical dynamics beyond those accessible to more traditional spectroscopies.\n                  <\/jats:p>","DOI":"10.1002\/chem.202502775","type":"journal-article","created":{"date-parts":[[2025,11,29]],"date-time":"2025-11-29T11:48:04Z","timestamp":1764416884000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photochemistry of Aromatic N\u2010Oxides in Water Probed by Time\u2010Resolved X\u2010ray Absorption Spectroscopy"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5559-0373","authenticated-orcid":false,"given":"Maximilian Paradiz","family":"Dom\u00ednguez","sequence":"first","affiliation":[{"name":"Van \u2019t Hoff Institute for Molecular Sciences University of Amsterdam  Amsterdam Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7077-4640","authenticated-orcid":false,"given":"Robby","family":"B\u00fcchner","sequence":"additional","affiliation":[{"name":"Institute for Methods and Instrumentation for Synchrotron Radiation Research Helmholtz\u2010Zentrum Berlin f\u00fcr Materialien Und Energie  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2689-8878","authenticated-orcid":false,"given":"Mattis","family":"Fondell","sequence":"additional","affiliation":[{"name":"Institute for Methods and Instrumentation for Synchrotron Radiation Research Helmholtz\u2010Zentrum Berlin f\u00fcr Materialien Und Energie  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1731-3869","authenticated-orcid":false,"given":"Albert M.","family":"Brouwer","sequence":"additional","affiliation":[{"name":"Van \u2019t Hoff Institute for Molecular Sciences University of Amsterdam  Amsterdam Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,11,29]]},"reference":[{"key":"e_1_2_10_2_1","first-page":"292","article-title":"The Photochemistry of Pyridine N\u2010oxide","author":"Alkaitis A.","year":"1968","journal-title":"Chemical Communications"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/cr00059a004"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-4020(01)81710-5"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/7081_2017_4"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-4039(01)99720-5"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1248\/cpb.14.1316"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1248\/cpb.14.1102"},{"key":"e_1_2_10_9_1","first-page":"767b","article-title":"Group Migration in the Photolysis of 6\u2010substituted Phenanthridine 5\u2010oxides","author":"Taylor E. 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