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Tunable synchrotron radiation was used to produce the SO<jats:sub>2<\/jats:sub><jats:sup>\u22c5+<\/jats:sup> ion in excited ro\u2010vibrational levels of the ionic ground state X<jats:sup>2<\/jats:sup>A<jats:sub>1<\/jats:sub> and mass spectrometry was employed to identify the product ions. Calculations in the frame of the density functional theory and variational transition state theory were combined to explore the dynamics of the reactions. The experimental results show that HSO<jats:sub>2<\/jats:sub><jats:sup>+<\/jats:sup> is the only product in both reactions. Its yield decreases monotonically with photon energy in the SO<jats:sub>2<\/jats:sub><jats:sup>\u22c5+<\/jats:sup>+H<jats:sub>2<\/jats:sub>O reaction, while it decreases at first and then increases in the SO<jats:sub>2<\/jats:sub><jats:sup>\u22c5+<\/jats:sup>+CH<jats:sub>4<\/jats:sub> reaction. Theory confirms this trend by calculating the rate constants at different temperatures and explains the results by means of the polar, spin and charge effects as well as structural reorganization occurring in the reaction coordinate. The dynamic behavior observed in these two reactions is of general and fundamental interest. It can also provide some insights on the role of these reactions in astrochemistry as well as in their use as models for bond\u2010activation reactions.<\/jats:p>","DOI":"10.1002\/chem.201700028","type":"journal-article","created":{"date-parts":[[2017,2,8]],"date-time":"2017-02-08T09:22:36Z","timestamp":1486545756000},"page":"6772-6780","source":"Crossref","is-referenced-by-count":24,"title":["HSO<sub>2<\/sub><sup>+<\/sup> Formation from Ion\u2010Molecule Reactions of SO<sub>2<\/sub><sup>\u22c5+<\/sup> with Water and Methane: Two Fast Reactions with Reverse Temperature\u2010Dependent Kinetic Trend"],"prefix":"10.1002","volume":"23","author":[{"given":"Antonella","family":"Cartoni","sequence":"first","affiliation":[{"name":"Dipartimento di Chimica Sapienza Universit\u00e0 di Roma  Pl.e Aldo Moro 5 00185 Roma Italy"},{"name":"Istituto di Struttura della Materia (ISM) Consiglio Nazionale delle Ricerche (CNR), Area della Ricerca di Roma 1  via Salaria Km 29,300 Monterotondo Scalo (RM) 00016 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniele","family":"Catone","sequence":"additional","affiliation":[{"name":"Istituto di Struttura della Materia (ISM) Consiglio Nazionale delle Ricerche (CNR), Area della Ricerca di Roma 2  via del Fosso del Cavaliere 10 00133 Roma Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paola","family":"Bolognesi","sequence":"additional","affiliation":[{"name":"Istituto di Struttura della Materia (ISM) Consiglio Nazionale delle Ricerche (CNR), Area della Ricerca di Roma 1  via Salaria Km 29,300 Monterotondo Scalo (RM) 00016 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mauro","family":"Satta","sequence":"additional","affiliation":[{"name":"Istituto per lo Studio dei Materiali Nanostrutturati (ISMN) Dipartimento di Chimica Sapienza Universit\u00e0 di Roma  P.le Aldo Moro 5 00185 Roma Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pal","family":"Markus","sequence":"additional","affiliation":[{"name":"Istituto di Struttura della Materia (ISM) Consiglio Nazionale delle Ricerche (CNR), Area della Ricerca di Roma 1  via Salaria Km 29,300 Monterotondo Scalo (RM) 00016 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lorenzo","family":"Avaldi","sequence":"additional","affiliation":[{"name":"Istituto di Struttura della Materia (ISM) Consiglio Nazionale delle Ricerche (CNR), Area della Ricerca di Roma 1  via Salaria Km 29,300 Monterotondo Scalo (RM) 00016 Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,4,5]]},"reference":[{"key":"e_1_2_7_1_1","unstructured":"\u00a0"},{"key":"e_1_2_7_2_2","doi-asserted-by":"publisher","DOI":"10.1088\/0034-4885\/75\/6\/066901"},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/mas.20114"},{"key":"e_1_2_7_4_1","unstructured":"\u00a0"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1038\/nchem.1889"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1039\/C6CP01940D"},{"key":"e_1_2_7_7_1","unstructured":"\u00a0"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00036a005"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1021\/jo801260f"},{"key":"e_1_2_7_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200462121"},{"key":"e_1_2_7_10_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200462121"},{"key":"e_1_2_7_11_1","unstructured":"\u00a0"},{"key":"e_1_2_7_12_2","doi-asserted-by":"publisher","DOI":"10.1063\/1.555940"},{"key":"e_1_2_7_13_2","doi-asserted-by":"publisher","DOI":"10.1086\/191752"},{"key":"e_1_2_7_14_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr400258m"},{"key":"e_1_2_7_15_2","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.6b03136"},{"key":"e_1_2_7_16_2","doi-asserted-by":"publisher","DOI":"10.1021\/jacs.6b00343"},{"key":"e_1_2_7_17_1","unstructured":"\u00a0"},{"key":"e_1_2_7_18_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201006424"},{"key":"e_1_2_7_18_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201006424"},{"key":"e_1_2_7_19_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201500649"},{"key":"e_1_2_7_19_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201500649"},{"key":"e_1_2_7_20_2","doi-asserted-by":"publisher","DOI":"10.1039\/c0cs00099j"},{"key":"e_1_2_7_21_2","doi-asserted-by":"publisher","DOI":"10.1038\/417507a"},{"key":"e_1_2_7_22_1","doi-asserted-by":"publisher","DOI":"10.1086\/181817"},{"key":"e_1_2_7_23_1","unstructured":"\u00a0"},{"key":"e_1_2_7_24_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.asr.2005.03.115"},{"key":"e_1_2_7_25_2","doi-asserted-by":"publisher","DOI":"10.1051\/0004-6361\/201014363"},{"key":"e_1_2_7_26_1","unstructured":"\u00a0"},{"key":"e_1_2_7_27_2","first-page":"29","volume":"213","author":"Marquette J. 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