We report a study by electron paramagnetic resonance on the E0 point defect in amorphous silicon dioxide (a-SiO2). Our experiments were performed on -ray irradiated oxygen-deficient materials and pointed out that the 29Si hyperfine structure of the E0 consists of a pair of lines split by 49 mT. On the basis of the experimental results, a microscopic model is proposed for the E0 center, consisting of a hole trapped in an oxygen vacancy with the unpaired electron sp3 orbital pointing away from the vacancy in a back-projected configuration and interacting with an extra oxygen atom of the a-SiO2 matrix.
AGNELLO S, BOSCAINO R, BUSCARINO G, GELARDI FM (2005). Modifications of optical absorption band of E'gamma center in silica. JOURNAL OF NON-CRYSTALLINE SOLIDS, 351(21-23), 1801-1804 [DOI: 10.1103/PhysRevLett.97.135502].
Modifications of optical absorption band of E'gamma center in silica
AGNELLO, Simonpietro;BOSCAINO, Roberto;BUSCARINO, Gianpiero;GELARDI, Franco Mario
2005-01-01
Abstract
We report a study by electron paramagnetic resonance on the E0 point defect in amorphous silicon dioxide (a-SiO2). Our experiments were performed on -ray irradiated oxygen-deficient materials and pointed out that the 29Si hyperfine structure of the E0 consists of a pair of lines split by 49 mT. On the basis of the experimental results, a microscopic model is proposed for the E0 center, consisting of a hole trapped in an oxygen vacancy with the unpaired electron sp3 orbital pointing away from the vacancy in a back-projected configuration and interacting with an extra oxygen atom of the a-SiO2 matrix.
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