Setting the problem
Microwave studies of nitrosyl complexes;
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Nitric oxide is a free radical, because it has one unpaired electron. This creates weak, short-lived complexes with a variety of species, which makes experimental investigations hard. Theoretical investigations are also quite involved because the spin of the unpaired electron can interact with the rotating motion of the complex and the nuclear spin of nitrogen. We also need to take into account that the unpaired electron can be either in the plane or perpendicular to the molecular plane, resulting in different molecular properties.