Orgel energy level diagrams

Orgel energy level diagrams, 13 182, 183 Orotic acid, 18 187... 

Fig. 4.20. Crystal-field-theory energy-level diagram for a d ion (after Orgel, 1966 reproduced with the publisher s permission).

Fig. 16. Part of an Orgel energy level diagram for a d ion in O symmetry, showing how the Tig level becomes lowest in energy in strong fields.

Fig. 17. Orgel energy level diagram for a

Fig. 2.13. Deformation of a tetrahedron to produce c/a > 1 and the corresponding energy level diagram. (Adapted from Dunitz Orgel, 1957.)...

The Orgel diagram for tetrahedral nickel(II), shown in Fig. 8, is similar to that for the octahedral case, but the levels are inverted. The lowest level, 3Ti(P), has the same symmetry properties as the higher level 3Ti(P), and the two influence each other therefore, since all transitions are from 3Ti(F), no transition corresponds to the splitting A. To a first approximation the transition energies should be given by 0.8 A, 1.8 A, and (3P — 3F) + 0.6 A 120). A is much smaller than in the octahedral case and the first transition, to 3Ti, lies in the far infrared and has not been observed. 

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