Dynamics of I^∗(²P_½)production in the ultraviolet photodissociation of alkyl iodides

Abstract

The relative quantum yields, Φ^∗, for the production of I^∗(²P_½) at 266,280, and -305 nm are reported for a series of primary alkyl iodides using the technique of two-photon laser-induced fluorescence for the detection of I (²P3/2)and I^∗(²P_½) atoms. Results are analyzed by invoking the impulsive energy disposal model, which summarizes the dynamics of dissociation as a single parameter. Comparison of our data with those calculated by a more sophisticated time-dependent quantum mechanical model is also made. Near the red edge of the alkyl iodideA band, absorption contribution from the ³Q₁ sta1te is important and the dynamics near the ³Q _o - ¹Q₁curv e-crossing region seem to be influenced by the kinematics of the dissociation process.