Delocalized Nature of the E'-delta Center in Amorphous Silicon Dioxide

Details Delocalized Nature of the E'-delta Center in Amorphous Silicon Dioxide Delocalized Nature of the E'-delta Center in Amorphous Silicon Dioxide

2005-03-08

arxiv.org/abs/cond-mat/0503174v1

Physical Review Letters, Volume 94, Issue 12, Page 125501, 2005

Physics

Condensed Matter

Other Condensed Matter

approved for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.125501

We report an experimetal study by Electron Paramagnetic Resonance (EPR) of E'-delta point defect induced by gamma ray irradiation in amorphous SiO2. We obtained an estimetion of the intensity of the 10 mT doublet characterizing the EPR spectrum of such a defect arising from hyperfine interaction of the unpaired electron with a 29Si (I=1/2) nucleus. Moreover, determining the intensity ratio between this hyperfine doublet and the main resonance line of E'-delta center, we pointed out that unpaired electron wave function of this center is actually delocalized over four nearly equivalent silicon atoms.

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