FLASH-PHOTOLYSIS OF IODIDES IN THE PRESENCE OF QUENCHING GASES - IV -PHOTOLYSIS OF A C2F5I-O-2 MIXTURE

The quenching buffer method was used in investigation of flash photoly sis of a C2F5I-O-2 mixture. A scheme of the main processes that accomp any photolysis: of this mixture was proposed. The rate constant of rec ombination of C2F5 radicals with O-2 molecules was determined. C2F5O2 peroxyl radicals, formed during photolysis, quenched the excited state s I(5(2)P(1/2)) Of the iodine atom and O-2*((1) Delta(g)) of the oxyg en molecule at rates characterised by constants close to their gas-kin etic limits. A high recombination efficiency of C2F5O2 peroxyl radical s with I(5(2)P(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.