O2(C3-DELTA-U-]A1-DELTA-G) BAND SYSTEM

The positive identification of the O2(C3Δua1Δg ) transition in discharge systems has established that most previously observed but unidentified bands in the 3000-5000 A spectral region in O2 afterglows belong to this system. It is shown that transitions from levels up to v′ = 6 have previously been seen, both in discharges and in the terrestrial nightglow. These levels of vibrational excitation in the C3Δu state are comparable to those observed in the more thoroughly studied A3Σ+u state. A set of C3Δu vibrational constants has been calculated which fit 17 analyzed bands with an average deviation of 0.6 A. Rotational constants have been obtained for the 4-3(C3Δu(F1)a1Δ g band from a spectrum reported by Degen. © 1979.