Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3

Karola Graupner, Thomas Field, C.A. Mayhew, I.I. Fabrikant, T.M. Miller, M. Braun, M.W. Ruf, H. Hotop, Lucy Graham

Research output: Contribution to journalArticle

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Abstract

Using two complementary experimental methods, we have measured partial (mass-resolved) cross-sections for dissociative electron attachment to the molecule trifluoromethyl sulfurpentafluoride (SF5CF3) at the gas temperature T-G = 300 K over a broad range of electron energies (E = 0.001-12 eV). The absolute scale for these cross-sections was obtained with reference to the thermal (T = 300 K) rate coefficient for anion formation (8.0(3) x 10(-8) cm(3) s(-1)). Below 1 eV, SF5- is the dominant product anion and formed through the lowest anion state which cuts the neutral SF5CF3 potential close to the S-C equilibrium distance. The highly resolved laser photoelectron attachment data exhibit a downward Wigner cusp at 86meV, indicating that the nu(4)(alpha(1)) vibrational mode is important for the primary attachment dynamics. Both SF5- and F- anions are formed with similar yields through the first excited resonance located near 3.6eV. Towards higher energies, the anions CF3-, SF4-, and SF3- are also produced. Summation of the partial cross-sections yields a total absolute cross-section for anion formation over the energy range 0.001-12 eV. This is used to calculate the dependence of the rate coefficient for dissociative electron attachment over a broad range of electron temperatures for the fixed gas temperature T-G = 300 K; good agreement is found between the calculated values and those obtained in a drift tube experiment. In addition to the experimental work, semiempirical R-matrix calculations have been Carried out for the energy dependence of the cross-section for SF5- formation. The experimental findings are semi-quantitatively recovered. (C) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)113-122
Number of pages10
JournalInternational Journal of Mass Spectrometry
Volume277
Issue number1-3
DOIs
Publication statusPublished - 01 Nov 2008

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electron attachment
Anions
Negative ions
anions
Electrons
cross sections
gas temperature
attachment
Gases
electron energy
Electron temperature
coefficients
Photoelectrons
cusps
SF5CF3
energy
vibration mode
photoelectrons
tubes
Temperature

Cite this

Graupner, Karola ; Field, Thomas ; Mayhew, C.A. ; Fabrikant, I.I. ; Miller, T.M. ; Braun, M. ; Ruf, M.W. ; Hotop, H. ; Graham, Lucy. / Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3. In: International Journal of Mass Spectrometry. 2008 ; Vol. 277, No. 1-3. pp. 113-122.
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abstract = "Using two complementary experimental methods, we have measured partial (mass-resolved) cross-sections for dissociative electron attachment to the molecule trifluoromethyl sulfurpentafluoride (SF5CF3) at the gas temperature T-G = 300 K over a broad range of electron energies (E = 0.001-12 eV). The absolute scale for these cross-sections was obtained with reference to the thermal (T = 300 K) rate coefficient for anion formation (8.0(3) x 10(-8) cm(3) s(-1)). Below 1 eV, SF5- is the dominant product anion and formed through the lowest anion state which cuts the neutral SF5CF3 potential close to the S-C equilibrium distance. The highly resolved laser photoelectron attachment data exhibit a downward Wigner cusp at 86meV, indicating that the nu(4)(alpha(1)) vibrational mode is important for the primary attachment dynamics. Both SF5- and F- anions are formed with similar yields through the first excited resonance located near 3.6eV. Towards higher energies, the anions CF3-, SF4-, and SF3- are also produced. Summation of the partial cross-sections yields a total absolute cross-section for anion formation over the energy range 0.001-12 eV. This is used to calculate the dependence of the rate coefficient for dissociative electron attachment over a broad range of electron temperatures for the fixed gas temperature T-G = 300 K; good agreement is found between the calculated values and those obtained in a drift tube experiment. In addition to the experimental work, semiempirical R-matrix calculations have been Carried out for the energy dependence of the cross-section for SF5- formation. The experimental findings are semi-quantitatively recovered. (C) 2008 Elsevier B.V. All rights reserved.",
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Graupner, K, Field, T, Mayhew, CA, Fabrikant, II, Miller, TM, Braun, M, Ruf, MW, Hotop, H & Graham, L 2008, 'Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3', International Journal of Mass Spectrometry, vol. 277, no. 1-3, pp. 113-122. https://doi.org/10.1016/j.ijms.2008.05.022

Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3. / Graupner, Karola; Field, Thomas; Mayhew, C.A.; Fabrikant, I.I.; Miller, T.M.; Braun, M.; Ruf, M.W.; Hotop, H.; Graham, Lucy.

In: International Journal of Mass Spectrometry, Vol. 277, No. 1-3, 01.11.2008, p. 113-122.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Highly resolved absolute cross-sections for dissociative electron attachment to SF5CF3

AU - Graupner, Karola

AU - Field, Thomas

AU - Mayhew, C.A.

AU - Fabrikant, I.I.

AU - Miller, T.M.

AU - Braun, M.

AU - Ruf, M.W.

AU - Hotop, H.

AU - Graham, Lucy

PY - 2008/11/1

Y1 - 2008/11/1

N2 - Using two complementary experimental methods, we have measured partial (mass-resolved) cross-sections for dissociative electron attachment to the molecule trifluoromethyl sulfurpentafluoride (SF5CF3) at the gas temperature T-G = 300 K over a broad range of electron energies (E = 0.001-12 eV). The absolute scale for these cross-sections was obtained with reference to the thermal (T = 300 K) rate coefficient for anion formation (8.0(3) x 10(-8) cm(3) s(-1)). Below 1 eV, SF5- is the dominant product anion and formed through the lowest anion state which cuts the neutral SF5CF3 potential close to the S-C equilibrium distance. The highly resolved laser photoelectron attachment data exhibit a downward Wigner cusp at 86meV, indicating that the nu(4)(alpha(1)) vibrational mode is important for the primary attachment dynamics. Both SF5- and F- anions are formed with similar yields through the first excited resonance located near 3.6eV. Towards higher energies, the anions CF3-, SF4-, and SF3- are also produced. Summation of the partial cross-sections yields a total absolute cross-section for anion formation over the energy range 0.001-12 eV. This is used to calculate the dependence of the rate coefficient for dissociative electron attachment over a broad range of electron temperatures for the fixed gas temperature T-G = 300 K; good agreement is found between the calculated values and those obtained in a drift tube experiment. In addition to the experimental work, semiempirical R-matrix calculations have been Carried out for the energy dependence of the cross-section for SF5- formation. The experimental findings are semi-quantitatively recovered. (C) 2008 Elsevier B.V. All rights reserved.

AB - Using two complementary experimental methods, we have measured partial (mass-resolved) cross-sections for dissociative electron attachment to the molecule trifluoromethyl sulfurpentafluoride (SF5CF3) at the gas temperature T-G = 300 K over a broad range of electron energies (E = 0.001-12 eV). The absolute scale for these cross-sections was obtained with reference to the thermal (T = 300 K) rate coefficient for anion formation (8.0(3) x 10(-8) cm(3) s(-1)). Below 1 eV, SF5- is the dominant product anion and formed through the lowest anion state which cuts the neutral SF5CF3 potential close to the S-C equilibrium distance. The highly resolved laser photoelectron attachment data exhibit a downward Wigner cusp at 86meV, indicating that the nu(4)(alpha(1)) vibrational mode is important for the primary attachment dynamics. Both SF5- and F- anions are formed with similar yields through the first excited resonance located near 3.6eV. Towards higher energies, the anions CF3-, SF4-, and SF3- are also produced. Summation of the partial cross-sections yields a total absolute cross-section for anion formation over the energy range 0.001-12 eV. This is used to calculate the dependence of the rate coefficient for dissociative electron attachment over a broad range of electron temperatures for the fixed gas temperature T-G = 300 K; good agreement is found between the calculated values and those obtained in a drift tube experiment. In addition to the experimental work, semiempirical R-matrix calculations have been Carried out for the energy dependence of the cross-section for SF5- formation. The experimental findings are semi-quantitatively recovered. (C) 2008 Elsevier B.V. All rights reserved.

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U2 - 10.1016/j.ijms.2008.05.022

DO - 10.1016/j.ijms.2008.05.022

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JO - International Journal of Mass Spectrometry

JF - International Journal of Mass Spectrometry

SN - 1387-3806

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