Several new radiation defects in triplet states occurring in electron-irradiated, synthetic α-quartz were observed by using electron paramagnetic resonance spectroscopy. These defects were stable at room temperature and above for years. The primary spin Hamiltonian parameter matrices g and D have now been determined for four stable triplet defects, which herein were labelled E6”, E7”, E8” and E9”. Inter-electron distances estimated by using the magnetic dipole model suggest that the structures of new E” centers involve the unpaired electrons located in the orbitals of two silicon atoms next to one oxygen vacancy each. The results suggest that the optical band at 5.67eV was related to these triplet defects.

Stable States of E'' Defects in α-Quartz. R.I.Mashkovtsev, Y.Pan: EPL, 2012, 98[5], 56005