Abstract
Band progressions of a Σ←Σ system showing predissociation in N+2 are observed using a coaxial fast-ion-beam-laser-photofragment spectrometer. The most consistent interpretation of these spectra is in terms of absorptions in the first negative system of N+2. Thus, the bands originate in five vibrational levels (v′′=32–36) of N+2 X 2Σ+g and populate quasibound states of at least three vibrational levels (v′′≳45) in the B 2Σ+u state which lie above the dissociation limit N+(3P0)+N(4S0). Measurements of the photofragment kinetic energies show that predissociation to the least exothermic fine-structure limit is favored.
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