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 OI*rel(λ) measured by kinetic spectroscopy methods. A report is given of measurements, under conditions avoiding the influence of such secondary processes on OI*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(2P1/2) atoms by alkyl iodide molecules are determined.