The magnetic dipole a1Δ →X3Σg− transition has been observed for the first time during the recombination of 16O atoms in an afterglow. The spectrum of the 0–0 band has been recorded with a high resolution Fourier transform interferometer. Accurate molecular constants, obtained by combining ir and microwave data, are given for the a1Δg and X3Σg− (ν = 0) electronic levels.
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Amiot et al. (1981) studied this question.