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.

Cannas, M., Gelardi, F., Pullara, F., Barbera, M., Collura, A., & Varisco, S. (2001). Absorption band at 7.6 eV induced by γ-irradiation in silica glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 280(1-3), 188-192 [10.1016/S0022-3093(00)00390-2].

Absorption band at 7.6 eV induced by γ-irradiation in silica glasses

CANNAS, Marco;GELARDI, Franco Mario;PULLARA, Filippo;BARBERA, Marco;
2001

Abstract

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.
Cannas, M., Gelardi, F., Pullara, F., Barbera, M., Collura, A., & Varisco, S. (2001). Absorption band at 7.6 eV induced by γ-irradiation in silica glasses. JOURNAL OF NON-CRYSTALLINE SOLIDS, 280(1-3), 188-192 [10.1016/S0022-3093(00)00390-2].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/214941
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