Relation entre la symétrie des groupements CuCl₄⁻ tétraédriques et les propriétés physiques des cupritétrachlorures. II. Absorption electronique dans l'infrarouge proche

The maximum wavelength λ_{d - d} of the transition between d orbitals of tetrachlorocuprates depends on the deformation D of the CuCl₄^2- tetrahedron in these crystals. On the basis of their experimental absorption spectra, the relation between λ_{d - d} and D is given for many tetrachlorocuprates so that the symmetry of the CuCl₄^2- ion can be predicted in some other crystals on the basis of the position of the d-d transition.