Pulsed ESR measurements of oxygen deficient type centers in various quartz

Phase-memory times TM for E′-centers in various quartz samples were measured by pulse-ESR. Manually ground quartz followed by γ-irradiation, α-irradiated quartz and that from a natural uranium deposit showed TM <8μs indicating strong spin-spin interactions due to localized spins. Quartz glass and neutron-irradiated quartz showed longer TM of 15–18μs. Natural SiO2 with dense spins, (not, vert, similar 3.96 Ga) and 12 sandstone from an impact crater were also examined.