Translational spectroscopy of the unimolecular dissociation N+2 → N+ + N

Abstract
An analysis is made of the momentum distribution of forward- and backward scattered N+ fragments, produced in the dissociation of N +2 from 5 keV ion beams at residual gas pressure. The pronounced structure observed is ascribed to the unimolecular dissociative decay of metastable states of N+2 having lifetimes between 6 × 10-8 and 3 × 10-4 s. Isotope effects are found to be strong. Possible interpretations of the observed (pre)dissociations are discussed