EPR study of the E′4 center in α-quartz

Abstract Electron paramagnetic resonance measurements of the E′4 center in α-quartz have now proven that this species contains one unpaired electron ( S= 1 2 ), with hyperfine splitting from one proton ( I= 1 2 ). The spin-Hamiltonian matrices g and A (H 1 ) have been measured at room temperature.