Absorption cross sections for gaseous ClNO2 and Cl2 at 298 K: Potential organic oxidant source in the marine troposphere
- 20 May 1992
- journal article
- Published by American Geophysical Union (AGU) in Journal of Geophysical Research: Atmospheres
- Vol. 97 (D7) , 7651-7656
- https://doi.org/10.1029/92jd00414
Abstract
The absorption cross sections for gaseous ClNO2 in the 200–370 nm region and for Cl2 in the 270–400 nm region have been determined at 298 K. The cross sections for Cl2 are in excellent agreement with the literature. At λ < 300 nm the absorption cross sections for ClNO2 are in good agreement with those of lilies and Takacs (1976/1977) and Nelson and Johnston (1981) but are higher than those of Martin and Gareis (1956) from 220 to 240 nm. In the tropospherically important region beyond 290 nm our results, which have been corrected for impurity Cl2 using a combination of mass spectrometry and UV absorption, fall between those of Martin and Gareis (1956) and lilies and Takacs (1976/1977) and are in excellent agreement with the values of Nelson and Johnston (1981). Estimates of the photolysis rate constants and photolytic lifetimes for ClNO2 for various solar zenith angles at the Earth's surface are reported. It is shown that atomic chlorine from ClNO2 photolysis may be a significant initiator of organic photooxidation in both moderately polluted and remote marine atmospheres.Keywords
This publication has 22 references indexed in Scilit:
- Heterogeneous reactions with NaCl in the El Chichon volcanic aerosolsGeophysical Research Letters, 1991
- The reaction of gaseous N2O5 with solid NaCl at 298 K: Estimated lower limit to the reaction probability and its potential role in tropospheric and stratospheric chemistryGeophysical Research Letters, 1991
- Heterogeneous reactions of N2O5 with H2O and HCl on ice surfaces: Implications for Antarctic ozone depletionGeophysical Research Letters, 1988
- Antarctic Ozone Depletion Chemistry: Reactions of N 2 O 5 with H 2 O and HCl on Ice SurfacesScience, 1988
- Estimation of night-time N2O5 concentrations from ambient NO2 and NO3 radical concentrations and the role of N2O5 in night-time chemistryAtmospheric Environment (1967), 1986
- Reaction of NO2 with NaCl and atmospheric implications of NOCl formationNature, 1983
- Mass-transport limitation to the rate of reaction of gases in liquid droplets: Application to oxidation of SO2 in aqueous solutionsAtmospheric Environment (1967), 1981
- Kinetics of the reaction of chlorine atoms with nitrosyl chloride and nitryl chloride and the photochemistry of nitryl chlorideThe Journal of Physical Chemistry, 1981
- Energy Transfer Processes in the Unimolecular Decomposition of Nitryl Chloride1Journal of the American Chemical Society, 1956
- Variation with Temperature of the Continuous Absorption Spectrum of Diatomic Molecules: Part I. Experimental, The Absorption Spectrum of ChlorinePhysical Review B, 1933