Mass spectrometric study of dissociative ionization of the SO2F2 molecule by monoenergetic electron impact .2. SF2+, SF+, SO2+ and SO+ ions
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The formation of SF+, SF2+, SO+ and SO2+ fragment ions from dissociative ionization of the SO2F2 molecule has been studied by means of a trochoidal electron velocity selector coupled to a mass spectrometer. The ionization efficiency curves of ions were measured and their appearance energies, both in ground and excited states, were determined, The experimental findings were combined with available thermochemical data to determine the following values: ionization energy IE (SF2) = 10.08 eV; Heat of formation, Delta H-f(SF2+) = 7.01 eV and bond dissociation energy, D(F2S-20) = 9.94 eV. (C) 1997 by John Wiley and Sons, Ltd.