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The chemiluminescence from the reaction of oxygen atoms and carbon suboxide in a flow system has been reinvestigated. In addition to the 'triplet' bands reported previously, two other band systems of CO were observed: the Herman bands, also in the red, and the Fourth Positive bands in the vacuum ultraviolet. The three electronic states show a common excitation limit of almost 9 eV above the ground state. The emission intensity in the red and in the vacuum ultraviolet vary together as the flame conditions are changed. Traces of hydrogen are not necessary for the chemiluminescence. The reaction responsible for the emission involves 'triplet-P'O and 'X--triplet sigma' C2O. The vacuum-ultraviolet emission from a O-C2H2 flame was found to be identical to that of the O-C3O2 flame. As required by the single-reaction hypothesis, the 'triplet' bands and probably the Herman bands were found in the spectrum of the O-C2H2 flame. Possible reactions which could form C2O in these flames are discussed. (Author)