An analysis of polarized Raman scattering in semiconducting In-doped crystals revealed the cubic (weakly-distorted) symmetry of the deep In center. This was the first direct observation of the (almost) totally symmetrical relaxation that was associated with the formation of a DX-like center.

Cubic-Symmetry DX-Like State of an In Center in Semiconducting CdF2. A.K.Kupchikov, A.I.Ryskin: Physics Letters A, 1998, 240[1-2], 112-4