Abstract
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 \ensuremath{\sim}5.5--\ensuremath{\sim}5.8 eV, explaining a growth of the compaction-derived metastable absorption band in germanosilicate glass in the range 5.5--6.0 eV.
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