| Autor: |
Carr, Sinéad, Shallcross, Dudley E., Canosa-Mas, Carlos E., WengerNow at the Department of Chemistry, John C., Cork, University College, Cork, Ireland., Sidebottom, Howard W., Treacy, Jack J., Wayne, Richard P. |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); 2003, Vol. 5 Issue: 18 p3874-3883, 10p |
| Abstrakt: |
Rate coefficients for the reactions of hydroxyl radicals and chlorine atoms with a series of halogenated acetones of the type CX3COCH3X H, Cl, F have been determined using a photolytic relative-rate technique at T 298 K and at 760 Torr total pressure. The reactions studied and the rate coefficients obtained are shown in the table.ReactionReaction numberRate coefficientcm3molecule−1s−1OH CH3COCH3 → products12.2 ± 0.5 × 10−13OH CH2ClCOCH3 → products24.2 ± 0.8 × 10−13OH CHCl2COCH3 → products33.8 ± 0.8 × 10−13OH CCl3COCH3 → products41.5 ± 0.3 × 10−14OH CH2FCOCH3 → products52.1 ± 0.4 × 10−13OH CF3COCH3 → products66.9 ± 1.3 × 10−15Cl CH3COCH3 → products72.2 ± 0.4 × 10−12Cl CH2ClCOCH3 → products82.0 ± 0.2 × 10−12Cl CHCl2COCH3 → products91.7 ± 0.3 × 10−13Cl CCl3COCH3 → products101.7 ± 0.3 × 10−14Cl CH2FCOCH3 → products118.2 ± 1.6 × 10−13Cl CF3COCH3 → products128.0 ± 1.6 × 10−15The errors quoted reflect an estimate of the absolute uncertainty in the measured rate coefficients of ±20. For reactions 7–12, Fourier transform infrared spectroscopy was used to identify products. Qualitative ultra-violet absorption spectra were also recorded for most of the halogenated species investigated in this study, and have been used together with the kinetic data to derive atmospheric lifetimes for these species. |
| Databáze: |
Supplemental Index |
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