OH- and O3-initiated atmospheric degradation of camphene: Temperature dependent rate coefficients, product yields and mechanisms

Royal Society Chemistry Advances

RSC

Lugar: Inglaterra; Año: 2017 vol. 7 p. 2733 - 2733

as-phase rate coefficients for the reactions of OH and O3 with camphene have been measured over the temperature range 288-311K using the relative rate method. The experiments were carried out in an environmental chamber using long-path FTIR spectroscopy to monitor the reactants. Room temperature rate coefficients (in cm3 molecule-1 s-1) of k(camphene + OH)= (5.1 ± 1.1) × 10-11 and k(camphene + O3)= (5.1 ± 1.1) × 10-19 were obtained for OH and O3 reactions, respectively. The temperature dependence of the reactions are best fit by the Arrhenius expressions (in cm3 molecule-1 s-1) k(camphene + OH) = (4.1 ± 1.2) × 10-12 exp [(754 ± 44)/T] for the OH reaction and k(O3 + camphene) = (7.6 ± 1.2) × 10-18 exp [-(805 ± 51)/T] for the O3 reaction. To the best of our knowledge, this is the first report of the temperature dependencies for the reactions of OH and O3 with camphene. In addition, product studies have been performed at (298 ± 2) K and 760 Torr of synthetic air for the reaction of OH +