ESR in X-irradiated As2O3 glass |
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Authors: | WM Pontuscka PC Taylor |
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Institution: | Naval Research Laboratory, Washington, D.C. 20375, USA |
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Abstract: | X-irradiation of glassy As2O3 at 77K or 300K produces an unusually large density (~5×1018 cm-3) of paramagnetic centers which are stable at 300K. The average spin-Hamiltonian parameters (g = 1.998, g⊥ = 1.984, A6 = 243G, A⊥ = 114G) indicate that these centers are analogous to those previously observed in As2Se3 and As2S3 glasses and that they consist of unpaired electrons localized on a non-bonding 4p orbital of an As atom. Unlike the results obtained for As2Se3 and As2S3, the concommitant holes in As2O3 are trapped on Fe2+ impurity sites which become Fe3+ and not on non-bonding oxygen p orbitals. The radiation induced ESR is also accompanied by a stable optical absorption tail which lies within the band gap and increases exponentially with energy. This absorption can be partially bleached with the application of sub-band-gap light. |
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