Abstract
The global modeling of NO2 line positions has been performed within the effective operators method. One hundred and ninety five parameters of the polyade model of the effective Hamiltonian have been fitted to 28016 line positions collected from the literature for the 0.006–7916 cm−1 wavenumber range. The global root mean square residual of the fit is 0.017 cm−1. The effective Hamiltonian used explicitely takes into account both the spin-rotation interactions within each vibrational state and numerous vibrational-rotational resonances. Indeed, resonances due to the first and second order C-type Coriolis interactions and Fermi and Darling-Dennison resonances had to be considered because of the approximate relations ω1 ≈ ω3 ≈ 2ω2 between three harmonic frequencies of NO2.
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