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Title ESR, optical absorption, and luminescence studies of the peroxy-radical defect in topaz
Creator/Author Priest, V. ; Cowan, D.L. (Department of Physics, University of Missouri-Columbia, Columbia, Missouri (USA)) ; Yasar, H. ; Ross, F.K. (University of Missouri Research Reactor (MURR), University of Missouri-Columbia, Columbia, Missouri (USA))
Publication Date1991 Nov 01
OSTI IdentifierOSTI ID: 6219411
Other Number(s)ISSN0163-1829; CODEN: PRBMD
Resource TypeJournal Article
Resource RelationPhysical Review, B: Condensed Matter ; Vol/Issue: 44:18
Subject360605 -- Materials-- Radiation Effects; SILICATE MINERALS-- CRYSTAL DEFECTS;SILICATE MINERALS-- PHYSICAL RADIATION EFFECTS; ABSORPTION;COLOR CENTERS;ELECTRON SPIN RESONANCE;LUMINESCENCE;NEUTRONS;PEROXY RADICALS
Related SubjectBARYONS;CRYSTAL DEFECTS;CRYSTAL STRUCTURE;ELEMENTARY PARTICLES;FERMIONS;HADRONS;MAGNETIC RESONANCE;MINERALS;NUCLEONS;POINT DEFECTS;RADIATION EFFECTS;RADICALS;RESONANCE;VACANCIES
Description/Abstract Fast-neutron irradiation of natural topaz crystals produces a single paramagnetic radiation damage center in high concentration.^ESR of this center shows a holelike spectrum with {ital S}=1/2 and a strongly anisotropic {ital g} tensor: {ital g}{sub {ital x}{ital x}}=2.0027, {ital g}{sub {ital y}{ital y}}=2.0055, and {ital g}{sub {ital z}{ital z}}=2.0407.^We identify this defect as an intrinsic O{sub 2}{sup {minus}} center in the form of a peroxy radical.^The orientation of the {ital g} tensor helps confirm this assignment, as does the extraordinary thermal stability; annealing temperatures near 800 {degree}C are required for complete removal.^Two uv absorption bands are associated with the peroxy radical, each with oscillator strength near 0.09.^Pumping in the higher energy band leads to a polarization-sensitive 2.5-eV luminescence; the other uv band apparently relaxes nonradiatively.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 9877-9882
System Entry Date2001 May 13

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