Tetragonally distorted octahedral sites electronic configurations

Figure 3.13 Crystal field states and electronic configurations of Fe2+ ions in regular octahedral and tetragonally distorted octahedral sites. The tetragonally distorted octahedron is elongated along the tetrad axis.

Analogous expressions apply to crystal field states for electronic configurations involving these orbitals (cf. fig. 3.13). These energy separations are shown in fig. 3.21. All three parameters, Dq(eq)y Dt and Ds, may be determined experimentally provided that energies of three absorption bands originating from transition metal ions in tetragonally distorted octahedral sites occur in the crystal field spectra. Equation (3.15) yields the Dq( a) parameter, so that the mean Dq parameter, Dq(m) may be calculated from... 

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