Abstract
Photodissociation kinetics of iodobenzene molecular ion has been investigated by mass-analyzed ion kinetic energy spectrometry (MIKES). A method has been devised to correct for the influence of collisional relaxation of the molecular ion occurring in the ion source on the rate constant. Theoretical analysis of the present rate-energy data on a nanosecond time scale together with previous microsecond data has found no firm evidence to support the transition state switching from an orbiting transition state to a tight transition state, especially at internal energy well above the threshold. At internal energy near the threshold, the transition-state switching has been found possible when the best literature value of 2.38 eV was used as the energy barrier
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