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The remission spectra of a number of Cu 2+ -containing oxidic solids in the region between 3500 and 25 000 cm -1  were found to show always — independent of the macroscopic lattice-symmetry — the typical three-band-structure expected for tetragonally distorted octahedra. It could be derived from the spectra of the perovskite-mixed-crystals Sr 2 (Cu χ Zni _ x Me)O 6  [Me=W 6+ , Te 6+ ] (0&amp;lt;χ≦1) hat these three bands have to be assigned to the transitions B 1g  → A 1g  , -→ B 2g  and → Eg with increasing energy. A crystal field formalism is developed, which allows a quantitative treatment of the spectra in correspondence with crystallographic data. The calculated ligand-field-parameters Δ do not differ much from those of Ni 2+  and Co 2+  in the same host lattices.

Über den Jahn-Teller-Effekt des Cu 2+ -Ions in oxidischen Festkörpern: I. In oktaedrischer Koordination