Electron paramagnetic resonance studies were made of a fluoro-aluminate glass which was based upon Usovite. The centers which were responsible for the electron paramagnetic resonance signals were introduced by bombardment with 150keV N+, O+. Ar+ or Pb+ ions to a dose of 2 x 1016/cm2. It was shown, by means of isochronal annealing experiments and computer simulations, that the electron paramagnetic resonance spectra comprised 4 components. These were a broad Gaussian line, 2 anisotropic spectra, and a narrow isotropic line of Lorentzian form. A comparison of the present results, with published data on -irradiated fluoride glasses and ion-implanted oxide glasses, led to the conclusion that the Gaussian line was due to the hole defects that were typical of fluoride glasses and which were located on several anions (such as F and O). The anisotropic FA1 and FA2 spectra were attributed molecular O2- ions. The narrow isotropic signal was attributed to large molecular ions, such as O2O-, O4-, CO+ and CO-, that were located in voids in the damaged implanted layer.

L.D.Bogomolova, J.O.Teplyakov, V.A.Jachkin, S.A.Prushinsky, V.L.Bogdanov. V.D.Khalilev, F.Caccavale, S.LoRusso. Optical Materials, 1996, 5[4], 311-20