Abstract

The electron spin resonance of a gamma-irradiated single crystal of thiodiglycolic acid was measured at room temperature at 9 kMc. From the analysis of the anisotropy in the spectroscopic spliting factor and in the nuclear hyperfine interaction constants, a model of the free radical HOOC–CH2–S–CH–COOHis proposed. In this free radical, the electron spin density is mainly in a π orbital, about 60% of which is the p orbital of the CH carbon, 2% is the 1s orbitals of the CH2 hydrogens, and 22% is in the p orbital of the S.

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