Phys. Rev. B 65, 172202 (2002) [4 pages]Microscopic model of photoinduced and pressure-induced UV spectral changes in germanosilicate glassReceived 23 January 2002; published 6 May 2002 We carry out quantum-chemical calculations on clusters of atoms modeling the local structure of the divalent Ge defect in germanosilicate glass. It is found that the divalent Ge defect can interact with a nearby bridging oxygen atom, leading to denser defect configurations. The excitation energy of the resulting diamagnetic defect center is calculated to be ∼5.5–∼5.8 eV, explaining a growth of the compaction-derived metastable absorption band in germanosilicate glass in the range 5.5–6.0 eV. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.172202
DOI:
10.1103/PhysRevB.65.172202
PACS:
61.43.Fs, 61.46.+w, 61.72.Ji
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