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

Kivimäki, Antti (author): Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,University of Oulu

Stråhlman, Christian (author): Malmö universitet,Malmö University,Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Institutionen för materialvetenskap och tillämpad matematik (MTM)

Sankari, Rami (author): Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,University of Tampere

(creator_code:org_t)

2020-02-21
2020
English.
In: Journal of Mass Spectrometry. - : Wiley. - 1076-5174 .- 1096-9888. ; 55:5

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Abstract Subject headings

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.

By the author/editor: Kivimäki, Antti; Stråhlman, Chris ...; Sankari, Rami; Richter, Robert

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

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