The electron spin resonance of irradiated glycine at 77°K

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Abstract
The electron spin resonance spectrum of the radical ĊH(NH3 +)CO2 -, I, trapped in irradiated glycine has been re-examined at 77°k and the hyperfine couplings obtained when the -NH3 + ceases to rotate. The individual hydrogens are clearly identified by reference to the x-ray structure. Improved values are obtained for the room temperature couplings of this radical. There is also, after irradiation at 77°k, a spectrum consisting of two broad lines tentatively attributed to one of the molecular ions; the species giving rise to this spectrum changes irreversibly into I on warming above 77°k.