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A number of computational studies have considered how the CH2OOS\u00ad(O)\u00adO heteroozonide (HOZ) adduct formed in the CI + SO2 reaction converts SO2 to SO3. In this work we use the CBS-QB3 quantum chemical method along with equation-of-motion spin-flip CCSD\u00ad(dT) and MCG3 theories to reveal new details regarding the formation and decomposition of the endo and exo conformers of the HOZ. Although \u223c75% of the parent CI + SO2 reaction is initiated by formation of the exo HOZ, hyperconjugation preferentially stabilizes many of the endo intermediates and transition structures by 1\u20135 kcal mol\u20131. Our quantum chemical calculations, in conjunction with statistical rate theory models, predict a rate coefficient for the parent CI + SO2 reaction of 3.68 \u00d7 10\u201311 cm3 molecule\u20131 s\u20131, in good agreement with recent experimental measurements. RRKM\/master equation simulations based on our quantum chemical data predict a prompt carbonyl + SO3 yield of &amp;gt;95% for the reaction of both the parent and dimethyl CI with SO2. The existence of concerted cycloreversion transition structures 10\u201315 kcal mol\u20131 higher in energy than the HOZ accounts for most of the predicted SO3 formation.<\/jats:p>","DOI":"10.1021\/acs.jpca.5b06565","type":"journal-article","created":{"date-parts":[[2015,9,23]],"date-time":"2015-09-23T16:24:22Z","timestamp":1443025462000},"page":"10316-10335","source":"Crossref","is-referenced-by-count":75,"title":["A Computational Re-examination of the Criegee Intermediate\u2013Sulfur\nDioxide Reaction"],"prefix":"10.1021","volume":"119","author":[{"given":"Keith T.","family":"Kuwata","sequence":"first","affiliation":[{"name":"Macalester College , , Saint Paul , Minnesota 55105-1899 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emily J.","family":"Guinn","sequence":"additional","affiliation":[{"name":"Macalester College , , Saint Paul , Minnesota 55105-1899 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew R.","family":"Hermes","sequence":"additional","affiliation":[{"name":"Macalester College , , Saint Paul , Minnesota 55105-1899 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jenna A.","family":"Fernandez","sequence":"additional","affiliation":[{"name":"Macalester College , , Saint Paul , Minnesota 55105-1899 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jon M.","family":"Mathison","sequence":"additional","affiliation":[{"name":"Macalester College , , Saint Paul , Minnesota 55105-1899 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke","family":"Huang","sequence":"additional","affiliation":[{"name":"Macalester College , , Saint Paul , Minnesota 55105-1899 ,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2015,9,23]]},"reference":[{"key":"2026081807113976000_cit1","doi-asserted-by":"publisher","first-page":"1704","DOI":"10.1039\/c3cp52842a","article-title":"Research Frontiers in the Chemistry of Criegee Intermediates\nand Tropospheric Ozonolysis","volume":"16","author":"Taatjes","year":"2014","journal-title":"Phys. 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