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Mass spectrometric study of the ionization and dissociation of sulphur hexafluoride by monoenergetic electron impact

✍ Scribed by M. Miletić; O. Nešković; M. Veljković; K. F. Zmbov

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
122 KB
Volume
12
Category
Article
ISSN
0951-4198

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✦ Synopsis

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 DH °f(SF 5 ) = 1.81 eV, DH °f(SF 4 ) = 4.12 eV, DH °f(SF 3 ) = 4.11 eV and DH °f(SF 3 ) = À 5.13 eV.

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