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  • Title: Evidence for the formation of an interstellar species, HCS+, during the ionic fragmentation of methyl thiofluoroformate, FC(O)SCH3, in the 100-1000 eV region.
    Author: Geronés M, Erben MF, Romano RM, Cavasso Filho RL, Della Védova CO.
    Journal: J Phys Chem A; 2010 Nov 25; 114(46):12353-61. PubMed ID: 21028766.
    Abstract:
    Total ion yield spectra and photoinduced fragmentations following S 2p, C 1s, O 1s, and F 1s inner shell excitations of methyl thiofluoroformate, FC(O)SCH(3), have been studied in the gaseous phase by using synchrotron radiation and multicoincidence techniques, which include photoelectron-photoion coincidence (PEPICO) and photoelectron-photoion-photoion coincidence (PEPIPICO) time-of-flight mass spectrometry. Fragmentation patterns deduced from PEPICO spectra at the various excitation energies show a moderate site-specific fragmentation. The dissociation dynamic for the main ion-pair production has been discussed. Two-, three-, and four-body dissociation channels have been observed in the PEPIPICO spectra, and the dissociation mechanisms were proposed. The high stability of the interstellar HCS(+) ion can be observed over the whole range of photon energies analyzed.
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