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RESEARCH PRODUCT

H(II) centers in natural silica under repeated UV laser irradiations

Marco CannasFabrizio MessinaRoberto Boscaino

subject

Pulsed laserKineticsTWOFOLD COORDINATED SIFOS: Physical sciencesATOMSParamagnetismMaterials ChemistryUv laserIrradiationEXPOSUREQuartzCondensed Matter - Materials ScienceSNChemistryNatural compoundRadiochemistryMaterials Science (cond-mat.mtrl-sci)Disordered Systems and Neural Networks (cond-mat.dis-nn)DEFECTSCondensed Matter - Disordered Systems and Neural NetworksCondensed Matter PhysicsDIFFUSIONElectronic Optical and Magnetic MaterialsWavelengthGE-DOPED SIO2MOLECULAR-HYDROGENGLASSESCeramics and Composites

description

We investigated the kinetics of H(II) centers (=Ge'-H) in natural silica under repeated 266nm UV irradiations performed by a Nd:YAG pulsed laser. UV photons temporarily destroy these paramagnetic defects, their reduction being complete within 250 pulses. After re-irradiation, H(II) centers grow again, and the observed recovery kinetics depends on the irradiation dose; multiple 2000 pulses re-irradiations induce the same post-irradiation kinetics of H(II) centers after each exposure cycle. The analysis of these effects allows us to achieve a deeper understanding of the dynamics of the centers during and after laser irradiation.

yearjournalcountryeditionlanguage
2004-01-01
10.1016/j.noncrysol.2005.04.012http://hdl.handle.net/10447/15421