Abstract:
The processes of the creation of anion Frenkel defects have been investigated in MgO crystals irradiated by fast $^{132}Xe$ ions with an energy of 0.23 GeV at room temperature. The spectra of optical absorption measured at room temperature in the region of 1.5–6.5 eV using a dual-beam spectrophotometer JASCO V-660 contain several bands ascribed to F and F$^{+}$ centers (two/one electron trapped by an oxygen vacancy), the simplest aggregate F$_2$ centers, as well as the band at 2.16 eV. The iron-related bands (up to 3 ppm of Fe) are peaked at 4.26 and 5.74 eV. The absorption spectra of an MgO crystal irradiated with X-rays were also investigated. The cathodoluminescence (CL) spectra, measured at 10-keV electron excitation at 5 K, contain emissions of F$^{+}$ and F centers peaked at 3.15 and 2.4 eV, respectively.
