Diamagnetic susceptibility, description

It must be emphasized, of course, that the model presented above is intended to describe only part of the evolution from the semiconductive state to the superconductive state and beyond into the semimetallic state. It is intended to describe only the normal state at the onset of the evolution of the superconductive state dictated by the density of carriers. To complete the description it is necessary to recognize the generation of the paired electron state and the resulting strong diamagnetic susceptibility which approaches - —. A thermochemical model describing the equilibria... 

As we can see, the diffuse orbitals play a dramatic part in the description of the magnetic properties of BeH not less two sets of these orbitals (basis set III) are necessary to obtain an accurate and converging value of the susceptibility. The BeH-anion should be diamagnetic and its mean susceptibility is of the order of -2.10- erg.G-2.mol"L Note that the use of a single set of supplementary diffuse orbitals is not sufficient to bring to light this magnetic property. 

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