Ultraviolet absorption spectrum of trifluoro-bromo-methane,difluoro-dibromo-methane and difluoro-bromo-chloro-methane in the vapor phase |
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Authors: | D Gillotay P C Simon |
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Institution: | (1) Institut d'Aéronomie Spatiale de Belgique, Avenue Circulaire, 3, B-1180 Brussels, Belgium |
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Abstract: | Ultraviolet absorption cross-sections of trifluoro-bromo-methane (CF3Br-Halon 1301), difluoro-dibromo-methane (CF2Br2-Halon 1202) and of difluoro-bromo-chloro-methane (CF2BrCl-Halon 1211) are measured in the wavelength interval 172–304 nm for temperatures ranging from 210 to 295 K with uncertainties of between 2 and 4%. They are compared with previous measurements available at room temperature. Temperature effects are discussed and parametrical formulae are proposed to compute the absorption cross-sections for wavelengths and temperatures useful in atmospheric modelling calculations. Photodissociation coefficients are presented and their temperature dependence is discussed. |
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Keywords: | Bromo-fluoro-methanes UV absorption cross-sections photodissociation coefficients temperature dependence |
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