ESR Studies of Irradiated Alkali Borate Glasses with High Alkali Oxide Content

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Abstract
Electron spin resonance(ESR) studies have been made of γ‐ray irradiated alkali borate glasses containing more than approximately 25 molar % alkali oxide. The alkali borate glasses (Li2O—, Na2O—, K2O—, Rb2O—, and Cs2O–B2O3) exposed to a γ‐ray dose of 1×108 R display ESRspectra which are partially resolved into four major absorption lines at both X‐ and K‐ band microwave frequencies. Details of this four‐line resonance have been found to depend on the particular alkali oxide used in making the glass. When the glass sample was enriched with the 10B isotope, the observed spectrum exhibited a seven‐line resonance instead of four absorption lines. It is concluded that the four‐ and seven‐line structures arise from an isotropic hyperfine interaction of a hole with the 11B and 10B nuclei, respectively. The atom containing the 11B or 10B nucleus is believed to be in a tetrahedral BO4 configuration in the glass structure.

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