New spectroscopic studies of the -band system of the molecule

In the emission spectrum of the nitric oxide isotopomer eight bands: 0 - 3, 0 - 4, 1 - 4, 1 - 5, 1 - 6, 2 - 6, 2 - 7 and 3 - 4 comprising about 1160 lines belonging to the -band system have been remeasured and reanalysed. The rotational analysis of these bands and the calculation of the rovibronic structure constants have been performed via a nonlinear least-squares fits with the effective Hamiltonians of Brown et al. The merged analysis of the currently analysed bands and earlier observed vibrational - rotational 1 - 0, 2 - 1 and 3 - 0 bands made it possible to considerably enlarge, unify and specify with greater precision the information about the and states in . In particular, new constants of the rovibronic structure have been calculated for the and levels and equilibrium molecular constants as well as the Franck - Condon factors and r centroids for the bands in the molecule.