Primary relaxation processes at the band edge of
- 7 June 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 70 (23) , 3588-3591
- https://doi.org/10.1103/physrevlett.70.3588
Abstract
The kinetics of photoinduced defect formation in high-purity silicas has been studied by femtosecond transient absorption spectroscopy in the visible and ultraviolet. Band edge two-photon excitation produces singlet excitons which decay in 0.25 ps into defects with the absorption spectra of nonbridging oxygen hole centers (≡Si-O⋅) and silicon E’ centers (≡Si⋅). We identify these defect pairs with the self-trapped triplet exciton and the 0.25 ps decay with the motion of the photoexcited oxygen atom. Similar results were obtained with both crystalline and amorphous silica samples.Keywords
This publication has 20 references indexed in Scilit:
- Evidence for pair generation of anE’ center and a nonbridging oxygen-hole center in γ-ray-irradiated fluorine-doped low-OH synthetic silica glassesPhysical Review B, 1992
- Structure of the self-trapped exciton in quartzPhysical Review Letters, 1990
- Generation mechanism of photoinduced paramagnetic centers from preexisting precursors in high-purity silicasPhysical Review B, 1990
- The model of a triplet self-trapped exciton in crystalline SiO2Journal of Physics C: Solid State Physics, 1988
- ODMR of recombination centres in crystalline quartzJournal of Physics C: Solid State Physics, 1984
- Exciton–phonon interaction in crystalline and vitreous SiO2Physica Status Solidi (b), 1983
- The lifetime of electrons, holes and excitons before self-trappingJournal of Physics C: Solid State Physics, 1977
- Electron states in-quartz: A self-consistent pseudopotential calculationPhysical Review B, 1977
- Drawing-induced coloration in vitreous silica fibersJournal of the Optical Society of America, 1974
- The Valence Bond Approximation in Crystals — Application to an Analysis of the Ultraviolet Spectrum in QuartzPhysica Status Solidi (b), 1968