The spectrum of no: rotational analysis of epsilon bands and new observations on the beta and delta band-systems

A rotational analysis has been made for the (0,4) and (0,3) bands of the system of nitric oxide. Rotational constants have been evaluated and it has been shown from consideration of the defect (due to A doubling) between P, Q and R combinations that the initial electronic state is of type 2 Σ + . Potential-energy curves for the known electronic states of NO are shown. Some observations have also been made on the excitation of the β and δ systems of NO in the nitrogen afterglow. Bands of the β system with ν'=5 and 6 have been obtained in emission. The energy of dissociation of NO and supposed predissociations in the spectrum are discussed. Flory and Johnston's interpretation of the photodissociation of NO by Hg 1832 A. appears to be incompatible with the present observations on the spectrum.