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RESEARCH PRODUCT

Modifications of optical absorption band of center in silica

Franco Mario GelardiRoberto BoscainoSimonpietro AgnelloGianpiero Buscarino

subject

Absorption spectroscopyChemistryg-factorThermal treatmentCondensed Matter PhysicsSignalMolecular physicsElectronic Optical and Magnetic Materialslaw.inventionNuclear magnetic resonancelawAbsorption bandThermalMaterials ChemistryCeramics and Compositessense organsIrradiationElectron paramagnetic resonance

description

Abstract We report an experimental study of the modifications induced by gamma ray irradiation and by thermal treatment of both the electron paramagnetic resonance (EPR) and the optical absorption spectra of the E γ ′ center in silica. Our data show that the main g-values of E γ ′ EPR signal change as a function of the irradiation dose together with a red shift of the peak position of the absorption band around 5.8 eV attributed to the same center. Changes in the opposite direction are observed in both signals after thermal treatments. The peak position change of the optical absorption band is in quantitative agreement with the g-values shift. This strict correlation is evidence for the existence of a structural degree of freedom of the E γ ′ centers reflected by both EPR and optical measurements.

yearjournalcountryeditionlanguage
2005-07-01Journal of Non-Crystalline Solids
https://doi.org/10.1016/j.jnoncrysol.2005.04.019