A Global Analysis of Pure Rotational Spectra of 14N16O2 in the Ground Vibrational State

The results of global analysis yielding an overall improved and most complete set of molecular constants, which characterizes the thorough centrifugal distortion and other interactions occurring in the NO2 molecule has been reported. A global analysis of available pure rotational spectra of NO2 in the ground vibrational state considering the high-order centrifugal distortion terms is in demand to turn out a set of molecular constants of higher integration and precision. The transitions observed by electronic paramagnetic resonance and laser magnetic resonance (LMR) were used with the transitions at zero fields observed by far-infrared Fourier transform, microwave, and microwave-optical double-resonance spectroscopies. It proves that the high-order centrifugal distortion correction terms are significant for transitions among high-lying rotational levels.