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The Influence of Irradiation Temperature on U.V. Induced Defect Creation in Dry Silica

Published online by Cambridge University Press:  25 February 2011

R. A. B. Devine ,
C. Fiori  and
J. Robertson
R. A. B. Devine
Affiliation:
CNET, BP 98, 38243 Meylan, France
C. Fiori
Affiliation:
CNET, BP 98, 38243 Meylan, France
J. Robertson
Affiliation:
CNET, BP 98, 38243 Meylan, France
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Abstract

Electron spin resonance measurements have been carried out on samples of Suprasil Wl (dry silica) subjected to ultraviolet laser radiation (λ = 248 nm, E = 5 eV/photon). Studies have been made for fixed irradiation temperature (room) variable accumulated ultraviolet dose and fixed accumulated dose (3000 J/cm2) at various irradiation temperatures in the range 110 K to 335 K. Three principal defect centers are observed. Non-bridging oxygen hole centers are created at all temperatures in the range studied with slightly higher efficiency at room temperature (ration 300 K/150 K ∼ 2.5). Comparison of the dose dependent growth curve of the 4.8 eV absorption and its isochronal annealing curve with those for the oxygen hole center clearly identify the origin of the absorption band with this defect. A threshold temperature ∼ 200 K is found for oxygen vacancy creation consistent with results on single crystalline quartz. Post irradiation annealing at 593 K eliminates the vacancy centers and the peroxy radical resonance appears. Its growth as a function of accumulated ultraviolet dose and irradiation temperature supports the hypothesis that peroxy radicals form by the trapping of diffusing, molecular oxygen at the oxygen vacancy center.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 61: Symposium P – Defects in Glasses , 1985 , 177
Copyright
Copyright © Materials Research Society 1986

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