Flash photolysis of iodides in the presence of quenching gases. IV. Photolysis of a C2F5I — O2 mixture

The quenching buffer method was used in investigation of flash photolysis of a C₂F₅I — O₂ mixture. A scheme of the main processes that accompany photolysis of this mixture was proposed. The rate constant of recombination of C₂F₅ radicals with O₂ molecules was determined. C₂F₅O₂ peroxyl radicals, formed during photolysis, quenched the excited states I*( 5²P_1/2) of the iodine atom and O₂*(¹Δ_g) of the oxygen molecule at rates characterised by constants close to their gas-kinetic limits. A high recombination efficiency of C₂F₅O₂ peroxyl radicals with I(5²P_3/2) iodine atoms was observed. The rate constants of reactions of C₂F₅O₂I molecules with I* and I atoms, resulting in rapid formation of molecular iodine, were also determined.