For two electron system ##\vec{S}_1##, ##\vec{S}_2##(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\mathcal{H}=J\vec{S}_1\cdot \vec{S}_2=J(\frac{1}{2}(S_{tot})^2-\frac{3}{4}) (1)[/tex]

How you get relation (1)?

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# Heisenberg hamiltonian

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