Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 353, Issue 5-7, Pages 599-604Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2006.10.031
Keywords
density functional theory; absorption; silica
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We present the first consistent comparison of the theoretically predicted structures and spectroscopic characteristics of holes trapped in crystalline and amorphous silica. The structure and spectroscopic properties of Ge and [AlO4](0) hole centers in alpha-quartz and self-trapped holes (STH1 and STH2) in silica glass were calculated using an ab initio embedded cluster method. The calculated principal values of g-tensor and hyperfine constants as well as the positions of maxima of optical absorption bands are in good agreement with the experimental data. In the case of Ge and [AlO4](0) hole centers, as well as STH1, the hole is almost fully localized on one O atom. In STH2 the hole is delocalized over two bridging O atoms. The calculated principal values of the g-tensor and hyperfine constants of STH1 and STH2 support the assignment based on ESR studies. The calculated optical absorption energies of one-center holes in a amorphous silica agree with the experimentally observed absorption bands assigned to STH1. (c) 2007 Elsevier B.V. All rights reserved.
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