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Mass spectrometric study of the ionization and dissociation of sulphur hexafluoride by monoenergetic electron impact
Author(s) -
Miletić M.,
Nešković O.,
Veljković M.,
Zmbov K. F.
Publication year - 1998
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19980630)12:12<753::aid-rcm227>3.0.co;2-z
Subject(s) - chemistry , electron ionization , ionization , ion , dissociation (chemistry) , mass spectrometry , atomic physics , fragmentation (computing) , sulfur hexafluoride , molar ionization energies of the elements , ionization energy , electron , bond dissociation energy , analytical chemistry (journal) , nuclear physics , physics , organic chemistry , chromatography , computer science , operating system
The ionization and fragmentation of SF 6 under electron impact has been examined by means of a trochoidal electron velocity selector and a mass spectrometer. The ionization efficiency curves of the positive ions were recorded and the appearance energies of different electronic states of these ions were determined. The experimental results were combined with auxiliary thermochemical data to evaluate the dissociation energies D ° ° (F 5 S–F) = 4.01 eV, D ° ° (F 4 S–2F) = 6.39 eV, D ° ° (F 3 S–3F) = 9.98 eV, the ionization energy of SF 5 , = 11.27 eV and heats of formation Δ H ° f (SF 5 + ) = 1.81 eV, Δ H ° f (SF 4 + ) = 4.12 eV, Δ H ° f (SF 3 + ) = 4.11 eV and Δ H ° f (SF 3 ) = − 5.13 eV. © 1998 John Wiley & Sons, Ltd.