Electron Spin Resonance Studies of Gamma-Irradiated Alkali Titanate Glasses

Electron spin resonance (ESR) studies have been made of alkali titanate glasses gamma irradiated at liquid‐nitrogen temperature. The radiation‐induced spectrum can be separated into two distinct parts: One is located at a $g$ value greater than that of the free electron, while the other has a lower $g$ value. The latter spectrum consists of two different resonance lines, the broad and sharp spectra. They are identified as arising from Ti³⁺ centers formed in TiO₆ units having one and two nonbridging oxygens, respectively. The high‐g‐value spectrum is also separated into two distinct resonance lines. Two different hole centers formed in titanium–oxygen units are proposed as being responsible for these resonances.