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• W2089907622 endingPage "7779" @default.
• W2089907622 startingPage "7760" @default.
• W2089907622 abstract "We report strong dependencies of electron-spin-resonance (ESR) signals in fused silica on x-ray dose, sample hydroxyl concentration [OH], and preirradiation sample-annealing temperature ${mathit{T}}_{mathit{F}}$. In general, the strengths of the E'-center ESR signal and the two oxgyen-hole-center signals increase nonlinearly with Cu-target x-ray dose; we ascribe this behavior to the coexistence of two processes: (1) The x-ray activation of the spins of pre-existing structural defects, and (2) the x-ray creation of new similar defects. From this model and the observed nonlinear dependence on dose, we obtain relative values for the number of pre-existing defects, their rate of activation by x rays, and the rate of creation of new defects. These relative values are then examined for their trends with respect to [OH] and ${mathit{T}}_{mathit{F}}$: For example, there are far more pre-existing E' precursor defects in ``dry'' Suprasil-W1 ([OH]2 ppm) than in ``wet'' Suprasil-1 ([OH]ensuremath{approxeq}1200 ppm) fused silica, yet new E' defects are about twice as easy to create with x rays in the ``wet'' material. In general, we find that the relative x-radiation ``hardness'' of different fused silica samples is strongly dependent on dose, hydroxyl content, and thermal history. From the [OH] and ${mathit{T}}_{mathit{F}}$ dependencies of spin concentrations, we conclude that none of the three spin-active defects can be identified with either of the two previously reported Raman-active defects, traditionally labeled ${mathit{D}}_{1}$ and ${mathit{D}}_{2}$. Moreover, we conclude that ${mathit{D}}_{2}$ is not a strongly preferential site for formation of the spin-active defects under x irradiation, and that ${mathit{D}}_{1}$ is unlikely to be such a site." @default.
• W2089907622 created "2016-06-24" @default.
• W2089907622 creator A5011342327 @default.
• W2089907622 creator A5036278856 @default.
• W2089907622 creator A5057050262 @default.
• W2089907622 creator A5087456885 @default.
• W2089907622 date "1993-04-01" @default.
• W2089907622 modified "2023-09-27" @default.
• W2089907622 title "X-ray creation and activation of electron spin resonance in vitreous silica" @default.
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• W2089907622 doi "https://doi.org/10.1103/physrevb.47.7760" @default.
• W2089907622 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10004783" @default.
• W2089907622 hasPublicationYear "1993" @default.
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