Abstract
Laboratory kinetic energy distributions of N + and O + fragments arising from 5 keV collision-induced dissociation of parent NO + ions with helium, are reported. These observations allow us to determine both the amount of translational energy converted into internal energy of NO +* and the relative translational energy of the (pre)dissociating fragments. The O − - N relative kinetic energy distribution extends from 0 to 18 eV, and a collision-induced transition to level of a predissociating state is shown to have lifetimes ranging from 40 to 140 ns. The N − + O distribution lies between 0 and 11 eV and involves transition to five (pre)dissociating states, three of which have the energies of 29±0.2 eV, 34±0.3 eV, 34.5±0.3 eV with respect to the ground state of NO.
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