INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
20 “OH reaction rate constants and UV absorption cross-sections of unsaturated esters”.
Autor/es:
M.A.TERUEL, S. LANE, A. MELLOUKI, G. SOLIGNAC AND G. LE BRAS
Revista:
ATMOSPHERIC ENVIRONMENT
Editorial:
Elsevier
Referencias:
Lugar: The Netherlands; Año: 2006 vol. 40 p. 3764 - 3772
ISSN:
1352-2310
Resumen:
    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 ) x 10-12 exp [(553 ± 51)/T] k2= (2.5 ± 0.8 ) x 10-12 exp [(821 ± 55)/T] k3= (2.3 ± 0.8 ) x 10-12 exp [(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 210-330 nm are reported. The results are presented, discussed and used to estimate the atmospheric lifetimes for the studied esters.