Search results for "Point defect"
showing 5 items of 65 documents
In-situ observation of β-ray induced optical absorption in a-SiO2: radiation darkening and room temperature recovery
2008
Inhomogeneous properties of defects in amorphous silica probed by time-resolved luminescence
2008
Inhomogeinity of Oxygen deficient centers in silica probed by nanosecond time-resolved luminescence measurements
2008
Resonance Raman of oxygen dangling bonds in amorphous silicon dioxide
2017
We investigate the origin of a resonance Raman band induced by ionizing radiation in amorphous silicon dioxide (silica glass), which can be detected under ultraviolet laser excitation. A silica sample, rich of oxygen-excess related defects, was prepared by treating some length of a pure-silica-core multimode fiber in an O2 atmosphere (at high temperature and pressure) and by irradiating it with X-rays at 10 MGy(SiO2) dose. A micro-Raman study revealed a gaussian band peaking at 896 cm−1 with a full width at half maximum of 32 cm−1, which could be detected by exciting the sample with the 325-nm line of a HeCd laser. This spectral feature is absent in the Raman spectra performed with the 442-…