ESR STUDIES OF IRRADIATED “O-ENRICHED SOL-GEL SILICAS Organic impurity effects and the structure of the nonbridging-oxygen hole center
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چکیده
ESR studies were carried out on “O-enriched sol-gel silicas subjected to lOO-keV X irradiation at 77°K. Separate samples were given pre-irradiation heat treatments at 250, 600. and 800°C. A strong induced resonance-due to ethyl alcohol radicals was found to decrease in intensity with increasing anneal temperature. Methyl radicals were also detected. The spectrum of the nonbridging-oxygen hole center, dominant only in the 600 and 800 o samples, was identified and characterized by its “0 hyperfine signature.
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تاریخ انتشار 2005