The technique of predissociation photofragment spectroscopy is applied to a study of the photodissociation of O+2, primarily in the 5750 to 5870 Å wavelength region. The major part of this predissociation is shown to be due to the transition b4Σga4Πu, with predissociation of levels N′=9–23 of a (v′=4) and N′=7–15 of a (v′=5) observed. The N′=9 level of a (v′=4) is shown to be 1.1±1.1 meV above the O(3P2)+O+(4S0) dissociation limit, providing, in conjunction with other previously measured spectroscopic quantities, improved dissociation energies for the O+2(a4Πu) and (b4Σg) states, as well as for the previously reported O2(X3Σg). The lifetimes of the N′=9–15 levels are shown to be (70±15) ×10−11 sec for the F ′1 and F ′4 components, and (42±8) ×10−11 sec for the F ′2 and F ′3 components, with the lifetimes of the F ′1 and F ′4 components at least 1.5 times greater than the lifetimes of the F ′2 and F ′3 components.

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