Mass spectrometric study of the dissociative ionization of sulphuryl fluoride by monoenergetic electron impact .1. Heteronuclear fragment ions
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The dissociative ionization of sulphuryl fluoride (SO2F2) under electron impact has been examined by using a trochoidal electron velocity selector and a magnetic sector mass spectrometer. The ionization efficiency curves of SO2F2+, SOF2+, SO2F+ and SOF+ have been recorded and the appearance energies of different electronic states of these ions were determined. The results were used to evaluate the dissociation energy D(OSF2-O)=5.32 eV, enthalpies of formation Delta H-f(SO2F)=-427.5 kJ/mol (-4.43eV), Delta H-f(SO2F+)=616 kJ/mol (6.39 eV), Delta H-f(SOF)=-207.5 kJ/mol (-2.15 eV), Delta H-f(SOF+)=710 kJ/mol (7.36 eV) and the ionization energies IE(SO2F)=10.82 eV and IE(SOF)=9.51 eV.