Abstract
The hyperfine splitting constant of the methyl radical, produced by the γ-irradiation of alkali metal acetates, decreases from that found in caesium acetate in the order potassium, sodium and lithium. Electron spin relaxation is also affected by the presence of alkali metals, showing some correlation with the changes in the hyperfine splitting constants. It is estimated that the intramolecular anisotropic dipolar interaction between the unpaired electron and the magnetic moment of the protons may be a major mechanism contributing to the electron spin relaxation, and that the variation in T 1 T 2 values among the metal acetate systems may be attributed to the freedom of molecular motion of the methyl radicals in the metal acetates.
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