Electron spin resonance observations were made of 3 distinct paramagnetic centers in glass samples. It was found that one center was intrinsic to the glass, while the other 2 were induced by KrF excimer laser radiation. The intrinsic center, with a broad electron spin resonance spectrum, was tentatively identified as being an O-associated hole center. One radiation-induced center faded slowly at room temperature, and its proposed structure was suggested to be that of an electron that was trapped in a diffuse orbital which was associated with a modifier ion. The other radiation-induced center was stable at room temperature, and corresponded to the VO• center which was observed in crystalline paratellurite.

J.D.Prohaska, J.Li, J.S.Wang, R.H.Bartram: Applied Physics Letters, 1995, 67[13], 1841-3