Atmospheric fate of CF3Br, CF2Br2, CF2ClBr, and CF2BrCF2BR
Atmospheric fate of CF3Br, CF2Br2, CF2ClBr, and CF2BrCF2BR
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CF3Br、CF2Br2、CF2ClBr 和 CF2BrCF2BR 的大气归宿
DOI：
10.1029/90jd02735
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发表时间：
1991
影响因子：
--
通讯作者：
A. Ravishankara
中科院分区：
文献类型：
--
作者：
J. B. Burkholder;R. R. Wilson;T. Gierczak;R. Talukdar;S. Mckeen;J. Orlando;Ghanshyam L. Vaghjiani;A. Ravishankara
报告了卤代烷烃 CF3Br、CF2ClBr、CF2Br2 和 CF2BrCF2Br 的温度依赖性紫外吸收截面。在210至296K的温度范围和190至320nm的波长范围内测量UV吸收截面。还使用脉冲光解和流管技术确定了 OH 与 CF3Br、CF2Br2、CF2ClBr 和 CF2BrCF2Br 反应的速率系数上限。 CF3Br、CF2ClBr、CF2Br2 和 CF2BrCF2Br 在 296 K 时的速率系数分别为 <1.2×10−16、<1.5×10−16、<5.0×10−16 和 <1.5×10−16 cm3molec−1 s−1。这些物质的紫外吸收截面数据和 OH 反应速率系数与一维模型相结合，得出 CF3Br、CF2ClBr、CF2Br2 和 CF2BrCF2Br 的大气寿命分别为 65、16、3.2 和 <20 年。
The temperature dependent UV absorption cross sections of the haloalkanes CF3Br, CF2ClBr, CF2Br2, and CF2BrCF2Br are reported. The UV absorption cross sections were measured over the temperature range 210 to 296 K and the wavelength range 190 to 320 run. Upper limits of the rate coefficients for the reactions of OH with CF3Br, CF2Br2, CF2ClBr, and CF2BrCF2Br were also determined using both pulsed photolysis and flow tube techniques. The rate coefficients at 296 K were found to be <1.2×10−16, <1.5×10−16, <5.0×10−16, and <1.5×10−16 cm3 molec−1 s−1 for CF3Br, CF2ClBr, CF2Br2, and CF2BrCF2Br, respectively. The UV absorption cross-section data and OH reaction rate coefficients of these species were combined with a one-dimensional model to yield atmospheric lifetimes of 65, 16, 3.2, and <20 years for CF3Br, CF2ClBr, CF2Br2, and CF2BrCF2Br, respectively.