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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Berg, W. W., Heidt, L. E., Pollock, W., Sperry, P. D., Cicerone, R. J., and Gladney, E. S., 1984, Brominated organic species in the Arctic atmosphere, Geophys. Res. Lett. 11, 429–432.
Brasseur, G. and Simon, P. C., 1981, Stratospheric and thermal response to long-term variability in solar UV irradiance, J. Geophys. Res. 86, 7343–7362.
Brasseur, G. and Simon, P. C., 1988, Changes in stratospheric ozone: observations and theories, Aeronomica Acta A334.
Class, Th., Kohnle, R., Ballschmiter, K., 1986, Chemistry of organic races in air VII: Bromo- and bromochloromethanes in air over Atlantic Ocea, Chemosphere 15, 429–436.
Cicerone, R. J., Heidt, L. E., and Pollock, W. H., 1988, Measurements of atmospheric methyl bromide (CH3Br) and bromoform (CHBr3), J. Geophys. Res. 93, 3745–3749.
Fabian, P., Borchers, R., Penkett, S. A., and Prosser, N. J. D., 1981, Halocarbons in the stratosphere, Nature 294, 733–735.
Gillotay, D. and Simon, P. C., 1988, Ultraviolet absorption cross-sections of methyl bromide at stratospheric temperatures, Ann. Geophysicae 6, 211–215.
Kockarts, G., 1976, Absorption and photodissociation in the Schumann-Runge bands of molecular oxygen in the terrestrial atmosphere, Planet. Space Sci. 24, 589–604.
Lal, S., Borchers, R., Fabian, P., and Kruger, B. C., 1985, Increasing abundance of CBrClF2 in the atmosphere, Nature 316, 135–136.
Molina, L. T., Molina, M. J., and Rowland, F. S., 1982, Ultraviolet absorption cross-sections of several brominated methanes and ethanes of atmospheric interest, J. Phys. Chem. 86, 2672–2676.
Nicolet, M., 1984, On the molecular scattering in the terrestrial atmosphere: an empirical formula for calculation in the homosphere, Planet. Space Sci. 32, 1467–1468.
Penkett, S. A., Jones, B. M. R., Rycroft, M. J., and Simmons, D. A., 1985, An interhemispheric comparison of the concentrations of bromide compounds in the atmosphere, Nature 318, 550–553.
Prather, M. J., McElroy, M. B., and Wofsy, S. C., 1984, Reductions in ozone at high concentrations of stratospheric halogens, Nature 312, 227–231.
Rodriguez, J. M., Ko, M. K. M., and Sze, N. D., 1986, Chlorine chemistry in the Antarctic stratosphere: Impact of OCIO and Cl2O2 and implications for observations, Geophys. Res. Lett. 13, 1292–1295.
Simon, P. C., Gillotay, D., Vanlaethem-Meuree, N., and Wisemberg, J., 1988, Ultraviolet absorption cross-sections of chloro- and chlorofluoro-methanes at stratospheric temperatures, J. Atmos. Chem. 7, 107–135.
WMO, 1985, Atmospheric Ozone 1985, WMO global ozone research and monitoring project, Report 16, vol. I, pp. 355–367.
Yung, Y. L., Pinto, J. P., Watson, R. T., and Sander, S. P., 1980, Atmospheric bromine and ozone perturbations in the lower stratosphere, J. Atmos. Sci. 37, 339–353.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gillotay, D., Simon, P.C. Ultraviolet absorption spectrum of trifluoro-bromo-methane, difluoro-dibromo-methane and difluoro-bromo-chloro-methane in the vapor phase. J Atmos Chem 8, 41–62 (1989). https://doi.org/10.1007/BF00053815
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00053815