Physics – Condensed Matter – Materials Science
Scientific paper
2004-10-24
J. Phys.: Condens. Matter 17 (2005) 3837
Physics
Condensed Matter
Materials Science
13 pages, 3 figures, 1 table
Scientific paper
10.1088/0953-8984/17/25/010
The kinetics of E' centers induced in silica by 4.7eV laser irradiation was investigated observing in situ their optical absorption band at 5.8 eV. After exposure the defects decay due to reaction with diffusing molecular hydrogen of radiolytic origin. Hydrogen-related annealing is active also during exposure and competes with the photo-induced generation of the centers until a saturation is reached. The concentrations of E' and H2 at saturation are proportional, so indicating that the UV-induced generation processes of the two species are correlated. These results are consistent with a model in which E' and hydrogen are generated from a common precursor Si-H.
Cannas Marco
Messina Fabrizio
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