Time-Resolved Studies of NO2 Photoinitiated Unimolecular Decomposition: Step-LikeVariation of Kappa uni (E). (Reannouncement with New Availability Information)

摘要

Time-resolved, subpicosecond-resolution measurements of NO, photoinitiatedunimolecular decay rates are reported for jet-cooled samples in the vicinity of the dissociation threshold. The molecules are excited by 385-400 nm tunable subpicosecond pulses to the 2B2 electronic state which is very strongly mixed with the 2A1, ground electronic state. Subsequent decomposition is probed by a 226 nm subpicosecond pulse which excites LIF in the NO product. When changing the amount of energy in excess of the dissociation threshold, a step-like increase of the reaction rate versus energy is observed.