کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4444241 | 1311230 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: OH reaction rate constants and UV absorption cross-sections of unsaturated esters OH reaction rate constants and UV absorption cross-sections of unsaturated esters](/preview/png/4444241.png)
Absolute rate coefficients have been determined for the gas-phase reactions of hydroxyl radicals with methyl acrylate (k1), methyl methacrylate (k2) and ethyl acrylate (k3). Experiments were performed using two different techniques, the relative rate method and the pulsed laser photolysis-laser induced fluorescence technique. The kinetic data obtained were used to derive the following Arrhenius expressions in the temperature range 253–374 K (in units of cm3 molecule−1 s−1): k1=(2.0±0.8)×10-12exp[(553±51)/T],k2=(2.5±0.8)×10-12exp[(821±55)/T],k3=(2.3±0.8)×10-12exp[(580±65)/T]. At 298 K, the reaction rate constants obtained by the two methods were in good agreement. In addition, the UV absorption spectra for the three unsaturated esters have been determined at (298±2) K and the absorption cross-sections in the wavelength region 215–298 nm were reported. The results are presented, discussed and used to estimate the atmospheric lifetimes for the studied esters.
Journal: Atmospheric Environment - Volume 40, Issue 20, June 2006, Pages 3764–3772