The hydrogen-exchange reaction in X-ray-irradiated crystals of glycine was studied with electron spin resonance techniques. An intraradical exchange was detected which took place between the NH3 hydrogens and the α hydrogen of the radical <tex-math>${\rm NH}_{3}{}^{+}\dot{{\rm C}}{\rm HCO}_{2}{}^{-}$</tex-math>. The exchange rate was very high so that the change in the absorption could not be followed by the available spectrometer. Another exchange between the hydrogen of the radical and those of the host crystal was also observed. This relatively slow exchange was essentially similar to the exchange reactions observed in X-ray-irradiated crystals of some other amino acids.

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