CN2O Carbon monoxide-dinitrogen

The molecule exhibits complex rotational and rotation-vibrational spectra in the microwave and millimetre wave regions due to the internal rotation of the N2 and CO subunits. Since the behaviour of the complex considerably deviates from that of a semi-rigid rotor, the rotational energy levels are treated for different K stacks separately according to 

Each AT stack has its own vibrational origin a K), a set of rotational and centrifugal distortion constants B, D, etc., and an asymmetry term AE(K) where 

For X = 0 the asymmetry term is equal to zero. In some cases one of the two sublevels (K(e) or K(f)) is involved in Coriolis interaction with K=0. In what follows the rotational state quantum numbers jco and yW of the two constituents (in the free-rotor limit) are given in the form (jco,Jim) = (0,0), (1,0), (0,1), and (1,1). The energy levels fall into two not communicating groups, ortho and para, with respect to the orientation of the two nitrogen spins where the total spin is / = 1 for para and / = 0 or 2 for ortho. For CO- N2 we have 7 = 1 for ortho and I =0 for para. 

Quantum State (/CO,7nn) Molecular Constants Reference Method 

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