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- W2036257273 abstract "The isotope dependence of the O+O2 exchange reaction is investigated by means of kinetic experiments and classical trajectory calculations on an accurate potential energy surface. The measurements confirm the previously reported negative temperature dependence and yield the rate coefficients for both the exothermic 18O+16O2→18O16O+16O and the endothermic 16O+18O2→16O18O+18O reaction between 233 and 353 K: k8=(3.4±0.6)×10−12 (300 K/T)1.1±0.5 cm3 s−1 and k6=(2.7±0.4)×10−12 (300 K/T)0.9±0.5 cm3 s−1. In addition, the ratio of these two rates, R, has been measured with comparatively higher precision. It is 1.27±0.04 at 300 K and also shows a distinct negative temperature dependence. Four types of classical trajectory calculations are performed in order to interpret the experimental result. They differ by the way in which the quantum mechanical zero-point energy of the reactants and the differences of zero-point energies between reactants and products, ΔEZPE≈±22 cm−1, are phenomenologically incorporated. Only calculations which account for ΔEZPE are successful in reproducing the temperature dependence of R. This emphasizes that ΔEZPE is an important factor in low-temperature ozone kinetics. At energies slightly above threshold a dynamical effect is found which additionally favors the exothermic over the endothermic reaction." @default.
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- W2036257273 date "2003-09-01" @default.
- W2036257273 modified "2023-09-27" @default.
- W2036257273 title "Isotope dependence of the O+O2 exchange reaction: Experiment and theory" @default.
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- W2036257273 doi "https://doi.org/10.1063/1.1595091" @default.
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