Physics – Condensed Matter – Materials Science
Scientific paper
2000-09-29
Physics
Condensed Matter
Materials Science
RevTeX 4 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.86.3064
The E' center is a paradigmatic radiation-induced defect in SiO2 whose peculiar EPR and hyperfine activity has been known since over 40 years. This center has been traditionally identified with a distorted, positively-charged oxygen vacancy V_O+. However, no direct proof of the stability of this defect has ever been provided, so that its identification is still strongly incomplete. Here we prove directly that distorted V_O+ is metastable and that it satisfies the key requirements for its identification as E', such as thermal and optical response, and activation-deactivation mechanisms.
Bernardini Fabio
Carbonaro Carlo M.
Fiorentini Vincenzo
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