Fragmentation of metastable SF6−* ions with microsecond lifetimes in competition with autodetachment

K. Graupner, T. A. Field, A. Mauracher, P. Scheier, A. Bacher, S. Denifl, F. Zappa, T.D. Maerk

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Fragmentation of metastable SF6-* ions formed in low energy electron attachment to SF6has been investigated. The dissociation reaction SF6-*?SF5-+F has been observed ~ 1.5–3.4 µs and ~ 17–32 µs after electron attachment in a time-of-flight and a double focusing two sector field mass spectrometer, respectively. Metastable dissociation is observed with maximum intensity at ~ 0.3 eV between the SF6-* peak at zero and theSF5- peak at ~ 0.4 eV. The kinetic energy released in dissociation is low, with a most probable value of 18 meV. The lifetime of SF6-* decreases as the electron energy increases, but it is not possible to fit this decrease with statistical Rice–Ramsperger–Kassel/quasiequilibrium theory. Metastable dissociation of SF6-* appears to compete with autodetachment of the electron at all electron energies.

Original languageEnglish
Article number104304
Number of pages8
JournalJournal of Chemical Physics
Issue number10
Early online date11 Mar 2008
Publication statusPublished - 2008

Bibliographical note

The authors also gratefully acknowledge financial support from the EPSRC (GR/N04362/2), the Royal Society (RSRG 21245), and the European Science Foundation (ESF) network EIPAM. This work is partially supported by the FWF, Wien and the European Commission, Brussels.


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