6533b857fe1ef96bd12b3c0f
RESEARCH PRODUCT
Absorption band at 7.6 eV induced by γ-irradiation in silica glasses
S. VariscoMarco CannasFilippo PullaraA. ColluraMarco BarberaFranco Mario Gelardisubject
Range (particle radiation)Absorption spectroscopyChemistrybusiness.industryE bandCeramics and CompositeCondensed Matter Physicsγ irradiationPhotochemistryElectronic Optical and Magnetic MaterialsParamagnetismOpticsAbsorption bandMaterials ChemistryCeramics and CompositesIrradiationAbsorption (electromagnetic radiation)businessdescription
Optical absorption of defects induced by γ-irradiation in both natural and synthetic silica is experimentally investigated in the vacuum-ultraviolet (UV) range. Our results show that γ-rays, in a dose range of 1000 Mrad, induce an absorption band centered at 7.6 eV, the so-called E band, whose growth kinetics is not related to γ-activated precursors but to defects of the glassy matrix directly induced via the breaking of Si–O bonds occurring under γ-irradiation. Moreover, we observe that γ-rays do not bleach the E band present in some silica samples before irradiation, so ruling out that the associated defects can be precursors of the paramagnetic E′ centers, also induced by γ-irradiation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-02-01 |