High resolution infra-red spectrum of the 2v3band of NO2

Abstract

The 2v ₃ B-type band of NO₂ has been measured, assigned and the spin splitting has been accounted for satisfactorily. Ground-state rotational constants have been obtained by fitting 6 microwave pure rotational transitions with 119 ground-state combination differences obtained in this work. The resulting ground-state rotational constants in cm^-1 are: where uncertainties are 3σ. Upper-state constants have also been obtained. Anomalous line intensities are observed throughout the band. The most striking of these anomalies is the observation of very strong ^PR_K series even for moderately high K values while no ^PP_K or ^RP_K lines have been observed.