{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,17]],"date-time":"2025-10-17T00:36:35Z","timestamp":1760661395217,"version":"build-2065373602"},"reference-count":21,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2020,2,21]],"date-time":"2020-02-21T00:00:00Z","timestamp":1582243200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["analyticalsciencejournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Mass Spectrom"],"published-print":{"date-parts":[[2020,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We have studied the dissociation of the trifluoromethane molecule, CHF<jats:sub>3<\/jats:sub>, into negative ionic fragments at the C 1s and F 1s edges. The measurements were performed by detecting coincidences between negative and positive ions. We observed five different negative ions: F<jats:sup>\u2212<\/jats:sup>, H<jats:sup>\u2212<\/jats:sup>, C<jats:sup>\u2212<\/jats:sup>, CF<jats:sup>\u2212<\/jats:sup>, and F<jats:sub>2<\/jats:sub><jats:sup>\u2212<\/jats:sup>. Their production was confirmed by the analysis of triple coincidence events (negative\u2010ion\/positive\u2010ion\/positive\u2010ion or NIPIPI coincidences) that were recorded with cleaner signals than those of the negative\u2010ion\/positive\u2010ion coincidences. The intensities of the most intense NIPIPI coincidence channels were recorded as a function of photon energy across the C 1s and F 1s excitations and ionization thresholds. We also observed dissociation channels involving the formation of one negative ion and three positive ions. Our results demonstrate that negative\u2010ion\/positive\u2010ion coincidence spectroscopy is a very sensitive method to observe anions, which at inner\u2010shell edges are up to three orders of magnitude less probable dissociation products than cations.<\/jats:p>","DOI":"10.1002\/jms.4487","type":"journal-article","created":{"date-parts":[[2019,12,11]],"date-time":"2019-12-11T12:56:52Z","timestamp":1576069012000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Negative\u2010ion\/positive\u2010ion coincidence spectroscopy as a tool to identify anionic fragments: The case of core\u2010excited CHF<sub>3<\/sub>"],"prefix":"10.1002","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0753-8164","authenticated-orcid":false,"given":"Antti","family":"Kivim\u00e4ki","sequence":"first","affiliation":[{"name":"Nano and Molecular Systems Research Unit University of Oulu  90014 Oulu Finland"},{"name":"MAX IV 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