Abstract
Collision-induced dissociation of 0.65 to 3.2 keV CO+ has been examined in an apparatus with an extended flight path through which reactant ions take a long time to travel. Reactant ions were produced by electron impact ionization and the short-lived excited states decayed radiatively prior to ion–molecule interactions. The electronic and vibrational state distributions of reactant ions as functions of ionizing electron energy have been estimated from published spectroscopic data and the dissociation cross sections determined for CO+(X 2Σ+,υ) ions. A metastable ion state (or states) also contributes to the dissociative channels and the relative contribution of this metastable state becomes more important as the incident ion kinetic energy is lowered. A threshold of approximately 19.5±1.0 V has been measured for this long-lived state leading to C+ in dissociative collisions.
Published Version
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