SF5CF3:: the atmospheric properties of this ultimate greenhouse gas

Richard Tuckett

SF5CF3: the atmospheric properties of this ultimate greenhouse gas

Richard Tuckett

Chemistry

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Abstract

One molecule of SF5CF3, an adduct of the SF5 and CF3 free radicals, causes more global warming than one molecule of any other greenhouse gas. Using coincidence spectroscopy at the Daresbury SRS, we have determined the strength of the SC bond to be as large as 3.86  0.45 eV or 372  43 kJ mol-1 . This molecule is therefore very unlikely to be removed from the earth’s atmosphere by UV photolysis in the stratosphere. Complementary experiments at Birmingham and Super-Aco, Paris have shown that the main sink route of this greenhouse pollutant is low-energy electron attachment in the mesosphere, with Lyman- photodissociation at 121.6 nm only being a minor channel. By comparison with data for SF6, the lifetime of SF5CF3 in the earth’s atmosphere is estimated to be ca. 1000 years.

Original language	English
Publisher	Government Research Council
Number of pages	5
Publication status	Published - 1 Jan 2004

Bibliographical note

Synchrotron Radiation Department of CCLRC, Annual Report 2004

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SRSreview_2004_completepaperAccepted author manuscript, 270 KBLicence: None: All rights reserved

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title = "SF5CF3:: the atmospheric properties of this ultimate greenhouse gas",

abstract = "One molecule of SF5CF3, an adduct of the SF5 and CF3 free radicals, causes more global warming than one molecule of any other greenhouse gas. Using coincidence spectroscopy at the Daresbury SRS, we have determined the strength of the SC bond to be as large as 3.86  0.45 eV or 372  43 kJ mol-1 . This molecule is therefore very unlikely to be removed from the earth{\textquoteright}s atmosphere by UV photolysis in the stratosphere. Complementary experiments at Birmingham and Super-Aco, Paris have shown that the main sink route of this greenhouse pollutant is low-energy electron attachment in the mesosphere, with Lyman- photodissociation at 121.6 nm only being a minor channel. By comparison with data for SF6, the lifetime of SF5CF3 in the earth{\textquoteright}s atmosphere is estimated to be ca. 1000 years. ",

author = "Richard Tuckett",

note = "Synchrotron Radiation Department of CCLRC, Annual Report 2004",

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T2 - the atmospheric properties of this ultimate greenhouse gas

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N2 - One molecule of SF5CF3, an adduct of the SF5 and CF3 free radicals, causes more global warming than one molecule of any other greenhouse gas. Using coincidence spectroscopy at the Daresbury SRS, we have determined the strength of the SC bond to be as large as 3.86  0.45 eV or 372  43 kJ mol-1 . This molecule is therefore very unlikely to be removed from the earth’s atmosphere by UV photolysis in the stratosphere. Complementary experiments at Birmingham and Super-Aco, Paris have shown that the main sink route of this greenhouse pollutant is low-energy electron attachment in the mesosphere, with Lyman- photodissociation at 121.6 nm only being a minor channel. By comparison with data for SF6, the lifetime of SF5CF3 in the earth’s atmosphere is estimated to be ca. 1000 years.

AB - One molecule of SF5CF3, an adduct of the SF5 and CF3 free radicals, causes more global warming than one molecule of any other greenhouse gas. Using coincidence spectroscopy at the Daresbury SRS, we have determined the strength of the SC bond to be as large as 3.86  0.45 eV or 372  43 kJ mol-1 . This molecule is therefore very unlikely to be removed from the earth’s atmosphere by UV photolysis in the stratosphere. Complementary experiments at Birmingham and Super-Aco, Paris have shown that the main sink route of this greenhouse pollutant is low-energy electron attachment in the mesosphere, with Lyman- photodissociation at 121.6 nm only being a minor channel. By comparison with data for SF6, the lifetime of SF5CF3 in the earth’s atmosphere is estimated to be ca. 1000 years.

M3 - Commissioned report

BT - SF5CF3:

PB - Government Research Council

ER -

SF5CF3: the atmospheric properties of this ultimate greenhouse gas

Abstract

Bibliographical note

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