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

doi:10.1063/1.2884346

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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Abstract

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 language	English
Article number	104304
Number of pages	8
Journal	Journal of Chemical Physics
Volume	128
Issue number	10
Early online date	11 Mar 2008
DOIs	https://doi.org/10.1063/1.2884346
Publication status	Published - 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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10.1063/1.2884346

Fragmentation of metastable SF6-* ions with microsecond lifetimes in competition with autodetachment
© 2008 American Institute of Physics
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@article{c93ca7eba59e4cd2b48f6fe48a0a767c,

title = "Fragmentation of metastable SF6−* ions with microsecond lifetimes in competition with autodetachment",

abstract = "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.",

author = "K. Graupner and Field, {T. A.} and A. Mauracher and P. Scheier and A. Bacher and S. Denifl and F. Zappa and T.D. Maerk",

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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journal = "Journal of Chemical Physics",

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T1 - Fragmentation of metastable SF6−* ions with microsecond lifetimes in competition with autodetachment

AU - Graupner, K.

AU - Field, T. A.

AU - Mauracher, A.

AU - Scheier, P.

AU - Bacher, A.

AU - Denifl, S.

AU - Zappa, F.

AU - Maerk, T.D.

N1 - 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.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

U2 - 10.1063/1.2884346

DO - 10.1063/1.2884346

M3 - Article

VL - 128

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 10

M1 - 104304

ER -

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

Abstract

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