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

Kivimäki, Antti LU ; Stråhlman, Christian LU ; Sankari, Rami LU and Richter, Robert (2020) In Journal of Mass Spectrometry 55(5).
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... (More)

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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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
C 1s, CHF, core ionization and excitation, F 1s, ion-ion coincidence techniques, negative ions, photodissociation
in
Journal of Mass Spectrometry
volume
55
issue
5
article number
e4487
publisher
John Wiley & Sons Inc.
external identifiers
  • pmid:31826309
  • scopus:85083912672
ISSN
1076-5174
DOI
10.1002/jms.4487
language
English
LU publication?
yes
id
f8477214-db0f-4a5e-a4d7-d742056a8e16
date added to LUP
2020-05-18 14:14:45
date last changed
2024-09-04 23:11:54
@article{f8477214-db0f-4a5e-a4d7-d742056a8e16,
  abstract     = {{<p>We have studied the dissociation of the trifluoromethane molecule, CHF<sub>3</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<sup>−</sup>, H<sup>−</sup>, C<sup>−</sup>, CF<sup>−</sup>, and F<sub>2</sub> <sup>−</sup>. 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.</p>}},
  author       = {{Kivimäki, Antti and Stråhlman, Christian and Sankari, Rami and Richter, Robert}},
  issn         = {{1076-5174}},
  keywords     = {{C 1s; CHF; core ionization and excitation; F 1s; ion-ion coincidence techniques; negative ions; photodissociation}},
  language     = {{eng}},
  number       = {{5}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Journal of Mass Spectrometry}},
  title        = {{Negative-ion/positive-ion coincidence spectroscopy as a tool to identify anionic fragments : The case of core-excited CHF<sub>3</sub>}},
  url          = {{http://dx.doi.org/10.1002/jms.4487}},
  doi          = {{10.1002/jms.4487}},
  volume       = {{55}},
  year         = {{2020}},
}