Kinetic Parameters for the Unimolecular Dissociation of Styrene Ion

Article abstract of DOI:10.1021/j100371a013

Time-resolved photodissociation measurements of the laser-induced fragmentation of styrene molecular ion have been carried out at 355 nm.Taking thermal energy content into account, a unimolecular dissociation rate of 6.3 * 10³ s^-1 at an internal energy of 3.66 eV was derived.The new measurement has been combined with previous data from photodissociation and photoionization to give a dissociation rate-energy curve spanning 2 decades of rate values.By RRKM fitting to this curve, unimolecular kinetic parameters E₀ = 2.43 +/- 0.05 eV and ΔS^% (1000K) = -3.9 +/- 1 cal mol^-1 K^-1 were derived.The conclusion that this dissociation proceeds through a rate-limiting thight activated complex at E₀ = 2.43 eV was affirmed.