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Bjerre, N.; Andersen, T.; Kaivola, M.; Poulsen, O., Perturbations in the b4«SIGMA»g- state of O2+ immediately below the predissoication limit, studied by high-resolution optical-optical double-resonance photofragment spectroscopy, Phys. Rev. A: Gen. Phys., 1985, 31, 167-170. [all data]