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

Antti Kivimäki, Christian Stråhlman, Rami Sankari, Robert Richter

Tutkimustuotos: ArticleScientificvertaisarvioitu

Abstrakti

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.
AlkuperäiskieliEnglanti
Artikkelie4487
Sivumäärä9
JulkaisuJOURNAL OF MASS SPECTROMETRY
Vuosikerta55
Numero5
Varhainen verkossa julkaisun päivämäärä11 joulukuuta 2019
DOI - pysyväislinkit
TilaJulkaistu - 2020
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

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