Abstract
Several E′-type defects have been revealed in neutron-irradiated natural and synthetic α-quartz by using electron paramagnetic resonance (EPR) spectroscopy. For the known center the primary spin Hamiltonian parameter matrices g and A(29Si) (hyperfine interaction with 29Si) have been refined and provide compelling evidence for spin trapping on the long-bond Si atom. The EPR spectra of the new center demonstrate that the super-hyperfine structure arises from the interaction with 27Al, the first-ever example of Al-associated E′ centers in crystalline quartz. The matrices g and A(29Si) of and another new center support the forward-oriented configuration proposed for the center in amorphous silica.
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