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Spin-Spin Coupling

Interaction between the magnetic moments of neighboring nuclei, resulting in splitting of NMR signals and providing information about coupling constants.
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The statement of the theorem

For two coupled neighboring nuclei, I1I_1 and I2I_2, the interaction Hamiltonian Hcoupling\mathcal{H}_{coupling} is defined by the scalar coupling constant JJ: \nHcoupling=2I1I2J\mathcal{H}_{coupling} = 2\text{I}_1 \text{I}_2 J \nThis interaction modifies the energy levels EE of the system, leading to an energy splitting proportional to JJ, which is measured in Hertz (Hz). The coupling constant JJ is independent of the applied magnetic field B0B_0.