Radiation-damage-induced defects in quartz. I. Single-crystal W-band EPR study of hole centers in an electron-irradiated quartz

Single-crystal W-band electron paramagnetic resonance (EPR) spectra of an electron-irradiated quartz, measured at room temperature, 110 and 77 K, disclose three previously reported hole centers (#1, G and an ozonide radical). The W-band EPR spectra of these three centers clearly resolve six magnetic...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2008-03, Vol.35 (2), p.103-115
Main Authors: Nilges, Mark J., Pan, Yuanming, Mashkovtsev, Rudolf I.
Format: Article
Language:English
Subjects:
Axes (reference lines)
Crystal defects
Crystallography and Scattering Methods
Crystals
Earth and Environmental Science
Earth Sciences
Electron paramagnetic resonance
Electrons
Geochemistry
Hyperfine structure
Mathematical analysis
Matrix methods
Mineral Resources
Mineralogy
Original Paper
Oxygen atoms
Quadrupoles
Quartz
Radiation damage
Silicon
Single crystals
Spectra
Symmetry
Tetrahedra
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Summary:Single-crystal W-band electron paramagnetic resonance (EPR) spectra of an electron-irradiated quartz, measured at room temperature, 110 and 77 K, disclose three previously reported hole centers (#1, G and an ozonide radical). The W-band EPR spectra of these three centers clearly resolve six magnetically nonequivalent sites each, whereas previous X- and Q-band EPR studies reported Centers #1 and the ozonide radical to consist of only three symmetry-related components and interpreted them to reside on twofold symmetry axes in the quartz structure. The calculated g matrices of Center #1 and the ozonide radical show that deviations from twofold symmetry axes are
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-007-0203-5