University of Oulu

Kivimäki, A, Stråhlman, C, Sankari, R, Richter, R. Negative‐ion/positive‐ion coincidence spectroscopy as a tool to identify anionic fragments: The case of core‐excited CHF3. J Mass Spectrom. 2020; 55:e4487. https://doi.org/10.1002/jms.4487

Negative‐ion/positive‐ion coincidence spectroscopy as a tool to identify anionic fragments : the case of core‐excited CHF₃

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Author: Kivimäki, Antti1,2; Stråhlman, Christian3,2; Sankari, Rami4,2;
Organizations: 1Nano and Molecular Systems Research Unit, University of Oulu, 90014 Oulu, Finland
2MAX IV Laboratory, Lund University, 22100 Lund, Sweden
3Department of Materials Science and Applied Mathematics, Malmö University, 20506 Malmö, Sweden
4Surface Science Group, Laboratory of Photonics, Physics Unit, Tampere University, 33014 Tampere, Finland
5Elettra-Sincrotrone Trieste, 34149 Trieste, Italy
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020060440757
Language: English
Published: John Wiley & Sons, 2020
Publish Date: 2020-12-11
Description:

Abstract

We have studied the dissociation of the trifluoromethane molecule, CHF₃, 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⁻, H⁻, C⁻, CF⁻, and F₂⁻. 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.

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Series: Journal of mass spectrometry
ISSN: 1076-5174
ISSN-E: 1096-9888
ISSN-L: 1076-5174
Volume: 55
Issue: 5
Article number: e4487
DOI: 10.1002/jms.4487
OADOI: https://oadoi.org/10.1002/jms.4487
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Subjects:
Copyright information: © 2019 John Wiley & Sons, Ltd. "This is the peer reviewed version of the following article: Kivimäki, A, Stråhlman, C, Sankari, R, Richter, R. Negative‐ion/positive‐ion coincidence spectroscopy as a tool to identify anionic fragments: The case of core‐excited CHF3. J Mass Spectrom. 2020; 55:e4487, which has been published in final form at https://doi.org/10.1002/jms.4487. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."