ANALYSIS OF THE ELECTRONIC EMISSION (A)OVER-TILDE2-SIGMA+-(X)OVER-TILDE2-PI-I OF NCO BY FOURIER-TRANSFORM SPECTROSCOPY

The electronic emission, from a radiofrequency discharge, of the A2SIGMA+-X2PI(i) 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 nu1 and nu3 and (0 2 0)2PHI of the electronic ground state. Several perturbations involving the lower vibronic levels are reported. Improved parameters for the three interacting 2PI levels (1 0 0) and (0 2 0) kappa and mu have been determined using the model of Woodward et al.