The electronic emission, from a radiofrequency discharge, of the Ã2Σ+-[Xtilde]2Πi transition of the free radical NCO has been recorded using high resolution Fourier transform spectroscopy. Some weaker bands were also observed in laser induced fluorescence experiments. The rotational structure of seven bands have been analysed and molecular constants have been obtained. Some of these bands involve the two fundamental vibrations v 1 and v 3 and (0 2 0)2Φ of the electronic ground state. Several perturbations involving the lower vibronic levels are reported. Improved parameters for the three interacting 2Π levels (1 0 0) and (0 2 0) κ and μ have been determined using the model of Woodward et al.
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Hemmerling et al. (1993) studied this question.
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