Emission bands at 4784, 5165, and 5788 Å have been observed in the afterglow of an electrical discharge through oxygen. From a comparison with liquid-oxygen spectra these bands have been assigned to double electronic transitions involving the 1Δg and 1Σg+ excited states of oxygen. The relative intensities of these bands have been measured under conditions where the concentrations of these excited species were varied by three different methods. The results support the original assignment of these bands.