Exposure of dilute solutions of the spin-trap 5,5-dimethyl-1-pyrroline 1-oxide (DMPO) in fluorotrichloromethane containing traces of water to 60Co γ-rays at 77 K gave the DMPO˙+ cation: annealing gave the four-line e.s.r. spectrum characteristic of the hydroxyl adduct.
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Chandra et al. (1986) studied this question.