Triplet state in high-purity silica glasses

Ryoichi Tohmon, Yasushi Shimogaichi, Yoshimichi Ohki, Kaya Nagasawa, Yoshimasa Hama

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Electron spin resonance in the spectral region about g=4, believed to be due to a triplet state, is investigated in y-irradiated high-purity silica glasses. The signal in this spectral region was first reported by Griscom, who attributed it to a cavity-like triplet state formed by chlorines. The signal near g=4 in the present study is found only in oxygen deficient samples (samples with optical absorption at 5.0-eV and 7.6-eV prior to y-irradiation). One of these oxygen deficient samples contains no chlorine, but instead contains florine. The signal intensities of the triplet are in good agreement with the chlorine or florine contents. These results suggest that the signal is due to a biradical at an oxygen deficient site (≡Si• •Si≡). When the samples are heat-treated in hydrogen atmosphere prior to y-irradiation, the triplet signal disappears, but not when treated with hydrogen at room temperature. This is consistent with the behavior of the oxygen vacancy (judging from the 5.0-eV absorption intensity), which is terminated by hydrogen-treatment at elevated temperature but remains after hydrogen-treatment at room temperature.

    Original languageEnglish
    Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
    Pages228-235
    Number of pages8
    Volume1128
    DOIs
    Publication statusPublished - 1989

    Fingerprint

    silica glass
    Fused silica
    Silica
    atomic energy levels
    Hydrogen
    Chlorine
    purity
    Oxygen
    chlorine
    oxygen
    hydrogen
    Irradiation
    Oxygen vacancies
    irradiation
    Optical Absorption
    Temperature
    Light absorption
    Vacancy
    Paramagnetic resonance
    room temperature

    ASJC Scopus subject areas

    • Applied Mathematics
    • Computer Science Applications
    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Tohmon, R., Shimogaichi, Y., Ohki, Y., Nagasawa, K., & Hama, Y. (1989). Triplet state in high-purity silica glasses. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 1128, pp. 228-235) https://doi.org/10.1117/12.961465

    Triplet state in high-purity silica glasses. / Tohmon, Ryoichi; Shimogaichi, Yasushi; Ohki, Yoshimichi; Nagasawa, Kaya; Hama, Yoshimasa.

    Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1128 1989. p. 228-235.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Tohmon, R, Shimogaichi, Y, Ohki, Y, Nagasawa, K & Hama, Y 1989, Triplet state in high-purity silica glasses. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 1128, pp. 228-235. https://doi.org/10.1117/12.961465
    Tohmon R, Shimogaichi Y, Ohki Y, Nagasawa K, Hama Y. Triplet state in high-purity silica glasses. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1128. 1989. p. 228-235 https://doi.org/10.1117/12.961465
    Tohmon, Ryoichi ; Shimogaichi, Yasushi ; Ohki, Yoshimichi ; Nagasawa, Kaya ; Hama, Yoshimasa. / Triplet state in high-purity silica glasses. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1128 1989. pp. 228-235
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