Microscopic model of photoinduced and pressure-induced UV spectral changes in germanosilicate glass
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 ~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.
- Publication:
-
Physical Review B
- Pub Date:
- May 2002
- DOI:
- 10.1103/PhysRevB.65.172202
- Bibcode:
- 2002PhRvB..65q2202U
- Keywords:
-
- 61.43.Fs;
- 61.46.+w;
- 61.72.Ji;
- Glasses;
- Point defects and defect clusters