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Communication: Highly accurate ozone formation potential and implications for kinetics
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Atmospheric ozone is formed by the O + O2exchange reaction followed by collisional stabilization of the O3 * intermediate. The dynamics of the O + O2reaction and to a lesser extent the O3 stabilization depend sensitively on the underlying potential energy surface, particularly in the asymptotic region. Highly accurate Davidson corrected multi-state multi-reference configuration interaction calculations reported here reveal that the minimal energy path for the formation of O3 from O + O2 is a monotonically decaying function of the atom-diatom distance and contains no “reef” feature found in previous ab initio calculations. The absence of a submerged barrier leads to an exchange rate constant with the correct temperature dependence and is in better agreement with experiment, as shown by quantum scattering calculations.
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