Triplet states of oxygen vacancy defects in α-quartz: Center

The paramagnetic center in triplet state occurring in electron-irradiated, synthetic α-quartz has been investigated by using electron paramagnetic resonance (EPR) spectroscopy. The primary spin Hamiltonian parameter matrices g, D and A (hyperfine interactions for five 29Si nuclei) have now been dete...

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Bibliographic Details
Published in:Europhysics letters 2014-08, Vol.107 (3), p.36005
Main Authors: Mashkovtsev, R. I., Pan, Y.
Format: Article
Language:English
Subjects:
Atomic energy levels
Atomic structure
Crystal defects
Crystallography
Electron paramagnetic resonance
Electron spin
Electrons
Lattice vacancies
Oxygen
Quartz
Structural models
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Summary:The paramagnetic center in triplet state occurring in electron-irradiated, synthetic α-quartz has been investigated by using electron paramagnetic resonance (EPR) spectroscopy. The primary spin Hamiltonian parameter matrices g, D and A (hyperfine interactions for five 29Si nuclei) have now been determined. The principal values and principal directions of D and A matrices allow us to suggest the structural model for this stable triplet defect. The center involves the two unpaired electrons located in the orbitals of two silicon atoms next to one oxygen vacancy each. Firm correlations between the spin Hamiltonian matrix principal axes and crystallographic directions have been attained.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/107/36005