Journal
PHYSICS AND CHEMISTRY OF MINERALS
Volume 36, Issue 4, Pages 207-216Publisher
SPRINGER
DOI: 10.1007/s00269-008-0270-2
Keywords
Natural quartz crystal; Optical luminescence; Si(1s) XANES and XEOL; Distinct crystal growth zones
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Funding
- The Natural Sciences and Engineering Research Council of Canada-Conseil de recherches en sciences naturelles et en genie du Canada (NSERC-CRSNG)
- Synchrotron Radiation Center (SRC) of the University of Wisconsin in Stoughton, WI
- National Science Foundation (NSF) [DMR-00537588]
- National Research Council Canada-Conseil national de recherches du Canada (NRC-CRNC)
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The optical luminescence excited with synchrotron radiation along a preferential orientation of a quartz crystal has been investigated. It is found that the crystal is composed of two distinct regions, only one of which luminesces upon X-ray excitation. This luminescence is generally uniform and exhibits emission bands in the blue (470 nm with a shoulder at 522 nm) and in the UV (340 nm) regions of the spectrum. The branching ratio for the intensity of these bands is sensitive to the excitation energy across the Si K-edge. XANES spectra collected by partial luminescence yield (PLY) suggest that both emission bands originate from the de-excitation of Si atoms in the quartz. The possible defect sites within the crystal structure that could account for the observed luminescence are investigated and discussed. Additional experiments are proposed to verify this assignment of the optical emission bands.
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