Orientational effects in luminescence of wide-gap crystals under polarized synchrotron radiation

Use of synchrotron radiation of X-ray range are received premeditated population of certain states of optical centers in beryllium oxide (Eg = 10.63 eV), and also display of orientational effects in other wide-band dielectrics and semiconductors with lowered local symmetry of a crystal lattice (α-Al2O3, LiB3O5, ZnO). The assumptions about the nature of this phenomena are presented.