New E ' centers in neutron-irradiated alpha-quartz

作者：Mashkovtsev R I^*; Pan Y^*

来源：EPL, 2016, 113(6): 64004.

DOI：10.1209/0295-5075/113/64004

Several E'-type defects have been revealed in neutron-irradiated natural and synthetic a-quartz by using electron paramagnetic resonance (EPR) spectroscopy. For the known E-2' center the primary spin Hamiltonian parameter matrices g and A(Si-29) (hyperfine interaction with Si-29) have been refined and provide compelling evidence for spin trapping on the long-bond Si atom. The EPR spectra of the new E-11' center demonstrate that the super-hyperfine structure arises from the interaction with Al-27, the first-ever example of Al-associated E' centers in crystalline quartz. The matrices g and A(29 Si) of E-11' and another new center (E-12') support the forward-oriented configuration proposed for the E-alpha' center in amorphous silica.

• 出版日期2016-3
• 单位Saskatchewan; Saskatoon