V-T relaxation of vibrationally excited singlet oxygen molecule in the EOIL systems

Abstract

Kinetics of vibrationally-excited singlet oxygen O2(a1Δ,v) molecule have been examined using pulsed laser technique.O2(a1Δ,v) molecules were produced by the pulsed 266 nm laser photolysis of ozone. The kinetics of O2(a1Δ) quenching were followed by observing the 1268 nm fluorescence of the O2 a1Δ-X3Σ transition. It has been found that the loss of O2(a1Δ,v) in the O(3P)/O3/N2 mixture is carried out both in chemical and in V-T process. We observed that the vibrational excitation of singlet oxygen molecule enhances the rate of reaction between O2(a1Δ,v) and O3 molecules. The rate constant of this process was estimated to be in the range 10-12-10-11 cm3/s. Rate constant of O2(a,v=1) quenching by CO2 was found to be (1.03±0.07)×10-14 cm3/s.