Search results for "Thermal recovery"

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Bleaching and thermal recovery of PL emissions in natural silica

2000

Abstract We have investigated the bleaching of two photoluminescence (PL) emissions at 3.1 and 4.2 eV and the related growth of an electron spin resonance (ESR) signal, consisting in a hyperfine doublet split by 11.8 mT, in natural silica γ-irradiated by low doses, up to 1 Mrad. These observations definitely support the existence of a conversion mechanism, from optically active defects to paramagnetic ones. To further investigate this conversion process and the stability of the γ-induced paramagnetic centers, we performed PL and ESR measurements in samples that, after a γ exposure at 1 Mrad dose, were thermally treated at various temperatures ranging from 330 to 430 K. We found that the int…

Nuclear and High Energy PhysicsPhotoluminescenceThermal recoveryChemistryAnnealing (metallurgy)Low doseAnalytical chemistryOptically activelaw.inventionParamagnetismlawElectron paramagnetic resonanceInstrumentationHyperfine structureNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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