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Negative-ion/positive-ion coincidence spectroscopy as a tool to identify anionic fragments: The case of core-excited CHF 3 .
- Source :
-
Journal of mass spectrometry : JMS [J Mass Spectrom] 2020 May; Vol. 55 (5), pp. e4487. Date of Electronic Publication: 2020 Feb 21. - Publication Year :
- 2020
-
Abstract
- We have studied the dissociation of the trifluoromethane molecule, CHF <subscript>3</subscript> , 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 <superscript>-</superscript> , H <superscript>-</superscript> , C <superscript>-</superscript> , CF <superscript>-</superscript> , and F <subscript>2</subscript> <superscript>-</superscript> . Their production was confirmed by the analysis of triple coincidence events (negative-ion/positive-ion/positive-ion or NIPIPI coincidences) that were recorded with cleaner signals than those of the negative-ion/positive-ion 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-ion/positive-ion coincidence spectroscopy is a very sensitive method to observe anions, which at inner-shell edges are up to three orders of magnitude less probable dissociation products than cations.<br /> (© 2019 John Wiley & Sons, Ltd.)
Details
- Language :
- English
- ISSN :
- 1096-9888
- Volume :
- 55
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Journal of mass spectrometry : JMS
- Publication Type :
- Academic Journal
- Accession number :
- 31826309
- Full Text :
- https://doi.org/10.1002/jms.4487