Chemical Reactivity in Microscopic Systems: The Nucleophilic Substitution of Halogenated Benzene Ions by Ammonia Studied in Molecular Clusters
摘要:
The reactivity of small dihalogenated benzene ions clustered with ammonia has been investigated through mass-selected two-color two-photon ionization. Two reaction channels are evidenced: halogen elimination and hydrogen halide elimination. Appearance thresholds of the different reactive paths have been measured as well as the kinetics of the reactions. From these measurements, a new reactive scheme is proposed.
Substitutionreactions in smallionic fluorochlorobenzene-(NH3)n clusters have been studiedthroughthresholdphotoelectron-photoioncoincidence techniques using synchroton radiation. In this experiment the internal energy of the cluster ion is well defined and therefore the change of the reactive pathways with the internal energy content of the parent ion can be evidenced.