Vibrational Energy Transfer in Ozone Excited to the (101) State: Double-Resonance Measurements and Semiclassical Calculations in the 200−300 K Temperature Range

Abstract

The relaxation of ozone excited into the (101) vibrational state is studied in O3−O2 and O3−N2 gas mixtures over the 200−300 K temperature range using a laser double-resonance (DR) technique. Rate coefficients for V−V transfer processes occurring in O3−O3 collisions are experimentally determined and theoretically calculated. The temperature exponent n obtained by fitting the calculated values with a law of the form k(T) = k(T0)(T0/T)n is in very good agreement with the experimental values. To model the vibrational energy deactivation processes occurring upon O3−foreign gas collisions, the rate coefficients for levels higher than the first dyad are deduced from the rate coefficients for the lowest states using simple scaling. The simulated DR signals obtained by a kinetic model using these values are in good agreement with the corresponding experimental DR signals over the entire temperature range.