Influence of secondary processes on the quantum yield of I(2P1/2) atoms formed by photolysis of iodides measured by a kinetic spectroscopy method

Numerical calculations of the kinetics of secondary processes occurring during photolysis of iodides (RI) are made using published values of the rate constants. It is shown that in the case of insufficient time resolution and a large number of photolysis-inducing pulses these processes may have a considerable influence on the relative values of the quantum yield Ф_I*^rel(λ) measured by kinetic spectroscopy methods. A report is given of measurements, under conditions avoiding the influence of such secondary processes on Ф_I*^rel(λ), of the values of this yield at λ = 266 nm for the following iodides RI:CF₃I, C₂F₅I, C₃F₇I, CF₃CFICF₃, C₄F₉I, (CF₃)₃CI, CH₃I, C₂H₅I, C₃H₇I, and CH₃CHICH₃. The rate constants of deactivation of I(²P_1/2) atoms by alkyl iodide molecules are determined.