A plot of many-electron ligand-field term energies relative to the ground state against a normalized ligand-field strength. Axes commonly use and , with the ratio of other interelectronic parameters stipulated. A change of ground-state term can create a break in the plotted reference.
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The Tanabe–Sugano diagram is a graphical representation used in the field of coordination chemistry and solid-state chemistry to illustrate the energy levels of electronic states in transition metal complexes. It is particularly useful for understanding the effects of ligand field splitting on the d-orbitals of transition metal ions as they interact with ligands.