Induced optical absorption in gamma, neutron and ultraviolet irradiated fused quartz and silica

Marshall, Christopher D.; Speth, Joel A.; Payne, Stephen A.

doi:10.1016/s0022-3093(96)00606-0

Cited by 157 publications

(91 citation statements)

References 26 publications

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“…In general, these absorption bands are associated with either oxygen deficiency or oxygen excess in the glass network [2,3]. The most fundamental radiation induced defects in glasses are the non-bridging oxygen hole center (NBOHC: Si-O*), the E' center ( Si*), the peroxy radical (POR: Si-O-O*), and the trapped electron (TE), where the notation " " represents three bonds with other oxygens in the glass network and "*" denotes an unpaired electron [2][3][4]. In the glass exposed to radiations, hole trapped color centers with characteristic absorption bands around 430 nm were formed upon irradiation, leading to the development of the brown color.…”

Section: 1coloration Of Glassmentioning

confidence: 99%

Effect of neutron-irradiation on optical properties of SiO2-Na2O-MgO-Al2O3 glasses

2009

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Silica based glasses are used as nuclear shielding materials. The effect of radiation on these glasses varies as per the constituents used in these glasses. Glasses of different composition of SiO 2 -Na 2 OMgO-Al 2 O 3 were made by melt casting techniques. These glasses were irradiated with neutrons of different fluences. Optical absorption measurements of neutron-irradiated silica based glasses were performed at room temperature (RT) to detect and characterize the induced radiation damage in these materials. The absorption band found for neutron-irradiated glasses are induced by hole type color centers related to non-bridging oxygen ions (NBO) located in different surroundings of glass matrix. Decrease in the transmittance indicates the formation of color-center defects. Values for band gap energy and the width of the energy tail above the mobility gap have been measured before and after irradiation. The band gap energy has been found to decrease with increasing fluence while the Urbach energy shows an increase. The effects of the composition of the glasses on these parameters have been discussed in detail in this paper.

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Section: 1coloration Of Glassmentioning

confidence: 99%

Effect of neutron-irradiation on optical properties of SiO2-Na2O-MgO-Al2O3 glasses

2009

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“…At variance, most of the works dealing with the generation of E' centers by UV laser photons have focused mainly on the E' center stationary concentration measured after irradiation [5,[7][8][9]. To our knowledge, only a few works have investigated the transient E' centers by monitoring the transmittance at 5.8 eV during irradiation [12][13][14]. In this paper we report experimental results obtained by in situ absorption spectra performed during and after laser exposure.…”

Section: Introductionmentioning

confidence: 99%

Nd:YAG laser induced E′ centers probed by in situ absorption measurements

Cannas

Messina

2005

Journal of Non-Crystalline Solids

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We investigated various types of commercial silica irradiated with a pulsed Nd:YAG laser radiation (4.66 eV), with exposure time ranging up to 10000 s. Transient E' centers were probed in situ by measuring the amplitude of the optical absorption band at 5.8 eV (due to E' centers) both during and after irradiation. The laser-induced absorption is observed only in natural samples, whereas the synthetic materials exhibit high toughness to radiation effect. The reported results evidence that the kinetics of E' centers is influenced by their reaction with diffusing molecular hydrogen H 2 made available by dimerization of radiolytic H 0 .

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“…44 A low pressure of 10 À3 Pa was maintained inside the irradiation chamber. To ensure uniform irradiation, Ar-ion beam was scanned and the current was maintained at approximately 2.0 lA cm As the radiation induced defects can be removed by annealing at temperatures higher than 623 K, 45 postirradiation thermal annealing is usually employed to anneal ion irradiated samples. Therefore, thermal annealing was conducted ex situ under high vacuum (4.25 Â 10 À5 Pa) at 773 K for 2 h. After that, optical absorption spectra were recorded over a wavelength range of 300-800 nm on a spectrophotometer (JASCO V-630) with a spectral bandwidth of 1 nm, and the SEM observations were used to examine the surface modification.…”

Section: Methodsmentioning

confidence: 99%

Ion irradiation synthesis of Ag–Au bimetallic nanospheroids in SiO2 glass substrate with tunable surface plasmon resonance frequency

Meng

Shibayama

et al. 2013

Journal of Applied Physics

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Ag-Au bimetallic nanospheroids with tunable localized surface plasmon resonance (LSPR) were synthesized by 100 keV Ar-ion irradiation of 30 nm Ag-Au bimetallic films deposited on SiO 2 glass substrates. A shift of the LSPR peaks toward shorter wavelengths was observed up to an irradiation fluence of 1.0 Â 10 17 cm À2, and then shifted toward the longer wavelength because of the increase of fragment volume under ion irradiation. Further control of LSPR frequency over a wider range was realized by modifying the chemical components. The resulting LSPR frequencies lie between that of the pure components, and an approximate linear shift of the LSPR toward the longer wavelength with the Au concentration was achieved, which is in good agreement with the theoretical calculations based on Gans theory. In addition, the surface morphology and compositions were examined with a scanning electron microscope equipped with an energy dispersive spectrometer, and microstructural characterizations were performed using a transmission electron microscope. The formation of isolated photosensitive Ag-Au nanospheroids with a FCC structure partially embedded in the SiO 2 substrate was confirmed, which has a potential application in solid-state devices. V C 2013 AIP Publishing LLC. [http://dx

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Induced optical absorption in gamma, neutron and ultraviolet irradiated fused quartz and silica

Cited by 157 publications

References 26 publications

Effect of neutron-irradiation on optical properties of SiO2-Na2O-MgO-Al2O3 glasses

Effect of neutron-irradiation on optical properties of SiO2-Na2O-MgO-Al2O3 glasses

Nd:YAG laser induced E′ centers probed by in situ absorption measurements

Ion irradiation synthesis of Ag–Au bimetallic nanospheroids in SiO2 glass substrate with tunable surface plasmon resonance frequency

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