Ultraviolet absorption cross-sections of chloro and chlorofluoro-methanes at stratospheric temperatures

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Discipline
Earth and related Environmental sciences
Subject
chlorofluorocarbon
chlorofluoromethane
chloromethane
halomethane
photodissociation coefficient
ultraviolet absorption
methyl chloride
chlorofluoromethane
photodissociation
stratosphere
temperature
ultraviolet radiation
Audience
Scientific
Date
1988Metadata
Show full item recordDescription
Absorption cross-sections of nine halomethanes (CCl4, CHCl3, CH2Cl2, CH3Cl, CFCl3, CF2Cl2, CF3Cl, CHFCl2, and CHF2Cl), measured between 174 and 250 nm for temperatures ranging from 225 to 295 K, are presented with uncertainties ranging from 2 to 4% and compared with previous determinations made for comparable temperature ranges. The largest temperature effect which takes place near the absorption threshold, decreases the absorption cross-section up to 50% for highly chlorinated methanes, but is negligible for molecules highly stabilized by hydrogen and/or fluorine. Extrapolated values for temperatures of aeronomical interest are presented, as well as parametrical formulas which give absorption cross-section values for given wavelength and temperature ranges.
Citation
Simon, P.C.; Gillotay, D.; Vanlaethem-Meuree, N.; Wisemberg, J. (1988). Ultraviolet absorption cross-sections of chloro and chlorofluoro-methanes at stratospheric temperatures. , Journal of Atmospheric Chemistry, Vol. 7, Issue 2, 107-135, DOI: 10.1007/BF00048042.Identifiers
scopus: 2-s2.0-0023822447
Type
Article
Peer-Review
Yes
Language
eng