EPR of Trapped H and D Atoms in γ-Irradiated Acidic Glasses. Anomalous Differential Saturation of Hyperfine Components via Cross Relaxation Induced by Paramagnetic Metal Ions

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Abstract
Cross relaxation is suggested as the mechanism for the observed anomalous differential saturation of the hyperfine components of trapped D atoms in γ-irradiated acid glasses. The theory of cross relaxation was examined. Further experimental confirmation was obtained from a detailed investigation of the abnormal saturation of trapped D and H atoms induced by the presence of paramagnetic transition-metal cations deliberately added to the system. The metal cations have a much shorter spin—lattice relaxation time, and their resonances overlap to different degrees with the hyperfine components of the trapped D and H atoms. The quantitative effect of concentration of these added paramagnetic metal cations on the cross relaxation process was also examined.