{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,10]],"date-time":"2026-07-10T17:24:21Z","timestamp":1783704261972,"version":"3.55.0"},"reference-count":48,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2024,3,27]],"date-time":"2024-03-27T00:00:00Z","timestamp":1711497600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100014806","name":"Elettra Synchrotron Trieste Proposal","doi-asserted-by":"publisher","award":["20220172"],"award-info":[{"award-number":["20220172"]}],"id":[{"id":"10.13039\/100014806","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100014806","name":"Elettra Synchrotron Trieste Proposal","doi-asserted-by":"publisher","award":["RP123188DE8F1717"],"award-info":[{"award-number":["RP123188DE8F1717"]}],"id":[{"id":"10.13039\/100014806","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Ateneo 2023","award":["20220172"],"award-info":[{"award-number":["20220172"]}]},{"name":"Ateneo 2023","award":["RP123188DE8F1717"],"award-info":[{"award-number":["RP123188DE8F1717"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>Gas-phase ion chemistry influences atmospheric processes, particularly in the formation of cloud condensation nuclei by producing ionic and neutral species in the upper troposphere\u2013stratosphere region impacted by cosmic rays. This work investigates an exothermic ionic route to the formation of hydroperoxyl radical (HO2) and protonated formaldehyde from methanol radical cation and molecular oxygen. Methanol, a key atmospheric component, contributes to global emissions and participates in various chemical reactions affecting atmospheric composition. The two reactant species are of fundamental interest due to their role in atmospheric photochemical reactions, and HO2 is also notable for its production during lightning events. Our experimental investigations using synchrotron radiation reveal a fast hydrogen transfer from the methyl group of methanol to oxygen, leading to the formation of CH2OH+ and HO2. Computational analysis corroborates the experimental findings, elucidating the reaction dynamics and hydrogen transfer pathway. The rate coefficients are obtained from experimental data and shows that this reaction is fast and governed by capture theory. Our study contributes to a deeper understanding of atmospheric processes and highlights the role of ion-driven reactions in atmospheric chemistry.<\/jats:p>","DOI":"10.3390\/molecules29071484","type":"journal-article","created":{"date-parts":[[2024,3,27]],"date-time":"2024-03-27T12:41:57Z","timestamp":1711543317000},"page":"1484","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Ionic Route to Atmospheric Relevant HO2 and Protonated Formaldehyde from Methanol Cation and O2"],"prefix":"10.3390","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5795-4700","authenticated-orcid":false,"given":"Mauro","family":"Satta","sequence":"first","affiliation":[{"name":"Institute for the Study of Nanostructured Materials-CNR (ISMN-CNR), Department of Chemistry, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7649-2756","authenticated-orcid":false,"given":"Daniele","family":"Catone","sequence":"additional","affiliation":[{"name":"Istituto di Struttura della Materia-CNR (ISM-CNR), Area della Ricerca di Roma 2, Via del Fosso del Cavaliere 100, 00133 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7909-5115","authenticated-orcid":false,"given":"Mattea Carmen","family":"Castrovilli","sequence":"additional","affiliation":[{"name":"Istituto di Struttura della Materia-CNR (ISM-CNR), Area della Ricerca di Roma 1, 00015 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9614-3174","authenticated-orcid":false,"given":"Francesca","family":"Nicolanti","sequence":"additional","affiliation":[{"name":"Department of Physics, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8170-1121","authenticated-orcid":false,"given":"Antonella","family":"Cartoni","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,3,27]]},"reference":[{"key":"ref_1","unstructured":"Anicich, G. 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