Structural relaxation of E' gamma centers in amorphous silica

Details Structural relaxation of E' gamma centers in amorphous silica Structural relaxation of E' gamma centers in amorphous silica

2002-03-13

arxiv.org/abs/cond-mat/0203280v1

Physics

Condensed Matter

Materials Science

4 pages, 2 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.66.113201

We report experimental evidence of the existence of two variants of the E' gamma centers induced in silica by gamma rays at room temperature. The two variants are distinguishable by the fine features of their line shapes in paramagnetic resonance spectra. These features suggest that the two E' gamma differ for their topology. We find a thermally induced interconversion between the centers with an activation energy of about 34 meV. Hints are also found for the existence of a structural configuration of minimum energy and of a metastable state.

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