RADIATION RESPONSE ON AL-H, ALKALI-H AND OTHER H-RELATED POINT-DEFECTS IN NATURAL QUARTZ CRYSTALS

Radiation responses of several new OH-related defect centers in unswept, Na-swept and H-swept natural quartz crystals of high and low-H concentrations have been determined. Both, the high-Hand low-H quartz crystals had nearly the same aluminum concentration. Irradiation was done using a van de Graaff electrostatic accelerator and the defect centers were monitored using near infrared absorption at 77K. Crystals were subjected to a sequence of low (77K) and room temperature (300K) irradiations that separate proton and alkali ion motions. The results have been discussed in terms of protons and alkali ions motion to shallow and deep traps and compared with cultured quartz.