Kinetics of CH2OO and syn-CH3CHOO reaction with acrolein

The kinetics for the reactions of CH2OO and syn-CH3CHOO with acrolein, a typical unsaturated aldehyde in the atmosphere, were studied in a flash photolysis flow reactor using the OH laser-induced fluorescence (LIF) method. The bimolecular reaction rate coefficients were measured at temperatures ranging from 281 to 318 K, and pressures ranging from 5 to 200 Torr. No obvious dependence of the rate coefficients on pressure was observed under the current experimental conditions. Both reactions exhibit negative temperature-dependence, with an activation energy of (-1.70 +/- 0.19) and (-1.47 +/- 0.24) kcal mol(-1) for CH2OO and syn-CH3CHOO reacting with acrolein, derived from the Arrhenius equation. At 298 K, the measured rate coefficients for CH2OO/syn-CH3CHOO + acrolein reactions are (1.63 +/- 0.19) x 10(-12) cm(3) s(-1) and (1.17 +/- 0.16) x 10(-13) cm(3) s(-1), respectively. The rate coefficient of the former reaction is in reasonable agreement with a recent theoretical result.

Automated summary

The kinetics of reactions between CH2OO and syn-CH3CHOO with acrolein in the atmosphere were studied, showing negative temperature-dependence with activation energies derived from the Arrhenius equation. The rate coefficients for these reactions were measured at different temperatures and pressures, with no significant pressure dependence observed.