Cyanide compounds electronic spectroscopy

We end this section with some considerations on spectroscopy. To do so, we return to the Werner systems discussed earlier, in particular to the fluoride and cyanide compounds, for which we have included in Table XVI the results of a few excited states. The excited states were chosen such that each corresponds to a configuration with a different 6g 3d ) occupation number. Although the different ligand field states are subject to the same type of nondynamical correlation effects, we notice that in some cases the occupation numbers of the ligand orbitals are significantly different for different states. This is especially true for the cyanide complexes, for which correlation effects actually tend to lose importance with each electron transferred from the t2g 3d ) into the eg 3d ) orbitals. The ligand field spectrum of these systems was described successfully in a... 

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