Tanabe–Sugano diagram

When Tanabe - Sugano diagram is a diagram in which all electronic states of a system, the energy difference E lowest state to the crystal field splitting energy can be applied to (typically ), both quantities normalized to the Racah parameter B.

The number of turns, which are intersected by a vertical line of a given result, the number of possible transitions, and thus the number of expected absorption characteristics. Tanabe Sugano the diagram is thus a correlation diagram, which enables the interpretation of absorption spectra of chemical compounds.

It can be observed the following fine structure splitting: