Ultraviolet absorption cross-sections of chloro and chlorofluoro-methanes at stratospheric temperatures期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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

Authors:	P C Simon D Gillotay N Vanlaethem-Meuree J Wisemberg

Institution:	(1) Institut d' Aéronomie Spatiale de Belgique, 3, Avenue Circulaire, B1180 Brussels, Belgium

Abstract:	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.

Keywords:	Chloromethanes chlorofluoromethanes ultraviolet absorption photodissociation coefficients temperature dependence
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