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The data allow a first experimental estimate of the triple ionisation potential of SO2 (69.0 \u00b1 3.6 eV), an energy in good agreement with a value derived in this study via computational chemistry. The triple ion combination S+ + O+ + O+ is clearly detected following electron collisions with SO2 at electron energies markedly below the vertical energy for forming SO23 +. This observation is accounted for by the operation of a stepwise pathway to the formation of S+ + 2O+ which does not involve the formation of a molecular trication.<\/jats:p>","DOI":"10.1063\/1.4803673","type":"journal-article","created":{"date-parts":[[2013,5,10]],"date-time":"2013-05-10T22:51:58Z","timestamp":1368226318000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":14,"title":["Electron ionisation of sulfur dioxide"],"prefix":"10.1063","volume":"138","author":[{"given":"James D.","family":"Fletcher","sequence":"first","affiliation":[{"name":"University College London Department of Chemistry, , 20 Gordon Street, London WC1H 0AJ, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael A.","family":"Parkes","sequence":"additional","affiliation":[{"name":"University College London Department of Chemistry, , 20 Gordon Street, London WC1H 0AJ, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephen D.","family":"Price","sequence":"additional","affiliation":[{"name":"University College London Department of Chemistry, , 20 Gordon Street, London WC1H 0AJ, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2013,5,10]]},"reference":[{"key":"2023080402552819000_c1","doi-asserted-by":"publisher","first-page":"1622","DOI":"10.1016\/j.atmosenv.2008.12.005","volume":"43","year":"2009","journal-title":"Atmos. 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