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FRANCO MARIO GELARDI

Modifications of optical absorption band of E'gamma center in silica

  • Authors: AGNELLO S; BOSCAINO R; BUSCARINO G; GELARDI FM
  • Publication year: 2005
  • Type: Articolo in rivista (Articolo in rivista)
  • Key words: Paramagnetic resonance; Dangling bonds; electron paramagnetic resonance
  • OA Link: http://hdl.handle.net/10447/11997

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.