Electron impact ionization studies for SF5CF3

Gstir, B.; Hanel, G.; Fedor, Juraj; Probst, Michael; Scheier, P.; Mason, Nigel J.; Märk, T.D.

doi:10.1088/0953-4075/35/11/314

Cited by 21 publications

(39 citation statements)

References 16 publications

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“…The electron energy loss spectrum (EELS) of SF 5 CF 3 has recently been measured and revealed that the threshold for the lowest-lying excited electronic state lies B8 eV above the ground state Mason, 2001, 2003, respectively), confirming the prediction of a high dissociation energy for the SF 5 -CF 3 bond (Gstir et al, 2002) of about 4 eV.…”

mentioning

confidence: 64%

Electron and photon induced processes in SF5CF3

Limão-Vieira¹,

Kendall²,

Eden³

et al. 2003

Radiation Physics and Chemistry

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The photo-absorption cross section of trifluoromethyl sulphur pentafluoride, SF 5 CF 3 has been measured using synchrotron radiation in the range of 4-11 eV (310 nm > l > 110 nm) and comparison made with electron energy loss spectroscopy (EELS). The measured VUV cross sections are used to derive the photolysis rate of SF 5 CF 3 in the terrestrial atmosphere. It is estimated that the lifetime for this molecule is the order of a 1000 years and the calculated global warming potential (GWP) is found to be between 17000 and 18100, making it one of the most potent global warming gases in the terrestrial atmosphere. r

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mentioning

confidence: 64%

Electron and photon induced processes in SF5CF3

Limão-Vieira¹,

Kendall²,

Eden³

et al. 2003

Radiation Physics and Chemistry

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“…The ionization energy is 11.8 eV. It was determined by fitting the measured data by a Wannier-like threshold law [23,24]. …”

Section: Methodsmentioning

confidence: 99%

Electron attachment properties of c-C₄F₈O in different environments

Chachereau¹,

Fedor²,

Janečková³

et al. 2016

J. Phys. D: Appl. Phys.

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Abstract. The electron attachment properties of octafluorotetrahydrofuran (c-C 4 F 8 O) are investigated using two complementary experimental setups. The attachment and ionization cross sections of c-C 4 F 8 O are measured using an electron beam experiment. The effective ionization rate coefficient, electron drift velocity and electron diffusion coefficient in c-C 4 F 8 O diluted to concentrations lower than 0.6% in the buffer gases N 2 , CO 2 and Ar, are measured using a pulsed Townsend experiment. A kinetic model is proposed, which combines the results of the two experiments.

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“…Since 2000, there have been a large number of new studies, some of direct importance to the atmospheric properties of SF 5 CF 3 , some of more general and pure scientific interest. They include VUV and XUV absorption [4,[15][16][17][18][19], valence photoelectron [4,15,[20][21][22], electron energy loss spectroscopy [4,23], electron scattering [24][25][26], protonation [27] and photofragmentation studies [20][21][22]28].…”

Section: Structure Spectroscopy and Thermochemistry Of Sf 5 Cfmentioning

confidence: 99%

“…The electron energy loss spectrum [23] [20,22], driven by the large and negative enthalpy of formation of CF 4 , but the significant re-arrangement of chemical bonds needed in the transition state makes this reaction kinetically unfavourable.) Taking SF 5 CF 3 as an example, we can define the first dissociative ionisation energy (DIE)…”

Section: 1mentioning

confidence: 99%

Chapter 3: Trifluoromethyl Sulphur Pentafluoride, SF5CF3: Atmospheric Chemistry and Its Environmental Importance via the Greenhouse Effect

Tuckett

2006

Fluorine and the Environment - Atmospheric Chemistry, Emissions, &Amp; Lithosphere

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Advances in Fluorine Science (2006) 1, chapter 3 (pp. 89-129) (Elsevier, ISBN 0-444-52811-3) Fluorine and the Environment : atmospheric chemistry, emissions and lithosphere DOI: 10.1016/S1872-0358(06) This is the author's version of a work that was accepted for publication in Advances in Fluorine Science.Changes resulting from the publishing process, such as editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in the reference given above. The DOI number of the final paper is also given above. highest per molecule radiative forcing of any greenhouse pollutant, and the value of its global warming potential is only exceeded by that of SF 6 . Using tunable vacuum-UV radiation from a synchrotron and coincidence spectroscopy, the strength of the central S−C bond in SF 5 CF 3 is determined to be 3.86 ± 0.45 eV or 372 ± 43 kJ mol -1 , and this molecule is very unlikely to be removed from the earth's atmosphere by UV photolysis in the stratosphere. Complementary laboratory-based experiments have shown that the main sink route of this greenhouse gas is low-energy electron attachment in the mesosphere, with Lyman-α photodissociation at 121.6 nm being only a minor channel. By comparison with data for SF 6 , the lifetime of SF 5 CF 3 in the earth's atmosphere is estimated to be ca. 1000 years. The principal reason for the current low level of concern about the impact of SF 5 CF 3 on our environment is that the concentration levels are still very low, at the sub parts per trilllion level. The high growth rate of ca. 6% per annum, however, should cause concern for policymakers.

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Electron impact ionization studies for SF5CF3

Cited by 21 publications

References 16 publications

Electron and photon induced processes in SF5CF3

Electron and photon induced processes in SF5CF3

Electron attachment properties of c-C₄F₈O in different environments

Chapter 3: Trifluoromethyl Sulphur Pentafluoride, SF5CF3: Atmospheric Chemistry and Its Environmental Importance via the Greenhouse Effect

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Electron impact ionization studies for SF5CF3

Cited by 21 publications

References 16 publications

Electron and photon induced processes in SF5CF3

Electron and photon induced processes in SF5CF3

Electron attachment properties of c-C4F8O in different environments

Chapter 3: Trifluoromethyl Sulphur Pentafluoride, SF5CF3: Atmospheric Chemistry and Its Environmental Importance via the Greenhouse Effect

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Electron attachment properties of c-C₄F₈O in different environments