Knowledge Bank

It is known from the interpretation of the hyperfine structure in the microwave spectra of the NO molecule that the ground state ($\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\pi 1/2$) of this molecule has the wave function$\mathrm{<mrow\; data-mjx-texclass="ORD">1</mrow>}$^{2}\pi_{1/2}-0.0247 ^{2}\pi_{3/2}-0.0025 ^{2}\Sigma_{1/2}, in which $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\pi 1/2(N(1s)2(2s)2(2p\sigma )2(2p\pi ):0(1s)2(2s)2(2p\sigma )2(2p\pi )2)$ contains about 1% of $N(1s)2(2s)(3s)(2p\sigma )2(2p\pi )$ $configuration.2$ $Dousmanus3$ made an analysis of $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\pi 1/2$ part of the above wave function and concluded 35% ionic character. He, however, used a very crude one-electron approximation. In our paper it is more carefully examined without taking into account the ionic character.