On the determination of molecular parameters for NO

All available high precision measurements on the ground state of NO have been used simultaneously in a weighted least squares procedure to determine the molecular parameters. In the present work the theoretical values were computed according to a model referred to as Hund's case (c_α), since this model seems to combine simplicity and high accuracy. The agreement between theoretical and observed frequencies is excellent and better than in previous investigations, even with a lower number of molecular parameters. Term values for NO are also computed, and they should be useful for predicting unobserved transitions.