2000
DOI: 10.1103/physrevlett.84.302 View full text |Buy / Rent full text
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Abstract: Interstitial O3 molecules in 7.9 eV photon-irradiated silica are identified. Their optical absorption band at 4.8 eV nearly coincides with the 4.8 eV band of nonbridging oxygen hole centers. The O3-related band is distinguished by a smaller halfwidth (0.84 vs 1. 05 eV), by susceptibility to ultraviolet bleaching, by lack of correlation to the 1.9 eV luminescence band, and by rise of a singlet O2 luminescence band at 0.974 eV during photobleaching. This identification solves a long controversy on the nature of … Show more

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“…Both bands were disentangled and the presence of O 3 was finally confirmed by observation that photobleaching of this 4.8 eV absorption band gives rise to infrared luminescence of singlet O 2 (Sect. 3.1), characteristically produced by UV-photolysis of O 3 [43].…”
Section: Interstitial Ozone Molecule Omentioning
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“…Both bands were disentangled and the presence of O 3 was finally confirmed by observation that photobleaching of this 4.8 eV absorption band gives rise to infrared luminescence of singlet O 2 (Sect. 3.1), characteristically produced by UV-photolysis of O 3 [43].…”
Section: Interstitial Ozone Molecule Omentioning
“…The photoluminescence excitation (PLE) profile consists of two bands: one centered at 4.80 eV with full width at half maximum (FWHM) of 1.05 eV and the other centered at 6.4 eV with FWHM of 1.7 eV [10]. The identification of the corresponding UV absorption bands correlated to the PL at 1.9 eV is limited to a few experiments [11,12], also because of the overlap of bands associated with other defects which makes difficult the analysis of the spectral shapes [3,4,13]. Recently, the optical properties of NBOHC have been also studied by computational methods [14][15][16].…”
Section: Introductionmentioning
“…In this respect the new model belongs to the class of microscopic models. [3][4][5][6][7] It is well known that germanium sites in silica have an absorption spectrum consisting of two strong singlet-singlet transitions near 242 nm and 180 nm. 17 The 242-nm absorption is strong for oxygen-deficient germanium-doped silica ͓e.g., with germanium-related oxygen-deficient centers ͑GODC's͒ such as two-coordinated germanium 18 ͔ and very weak or absent for fully oxidized silica.…”
Section: Energy Levels and Transfer Mechanismsmentioning
“…Microscopic models are based on the assumption that defects formed in the glass lead to a higher refractive index. [3][4][5][6][7] A large number of defects have been identified using different spectroscopic methods and theoretical calculations. However, no satisfactory quantitative agreement has been found with experimentally observed index changes.…”
Section: Introductionmentioning