Theory of the Fine Structure of the Microwave Spectrum of NO2

The effects of the magnetic interactions between the electronic spin, nuclear spin, and molecular rotation on the rotational energy levels of N${\mathrm{O}}_2$ molecule have been investigated and a theory of the fine structure of the microwave spectrum of this molecule is presented. A new method for calculating the matrix elements of the magnetic interaction terms has been developed. Possible extension of this theory to include the general type of polyatomic molecules with $S=\frac{1}{2}$ is discussed.