Radiation-Induced Free Radicals in Frozen Aqueous Solutions of Glycine

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Abstract
Radiation-induced free radicals in frozen aqueous solutions of glycine were studied by electron spin resonance spectroscopy. At 77[degree]K the resonance spectra exhibit composite patterns of ESR centers induced in water as well as in glycine molecules. Water resonance at 77 [degree]K is ascribed to OH radicals and some unidentified ESR species. The radiation yield for all ESR centers in H2O at 77[degree]K is G = 1.0. About 50% is presumed to be OH radicals. The water resonance is relatively unstable and disappears rapidly in the temperature range 100[degree] to 120[degree]K, whereas the glycine radicals are much more stable and may be observed at temperatures nearly up to the melting point of the solution. Glycine radicals are proposed to be +NH3CHCOO- and CH2COO". The number of glycine radicals increases almost linearly with concentration. These data indicate that the major fraction of the glycine radicals induced at 77[degree]K is the result of the direct action of radiation. Based on this assumption, the yield for glycine radicals is G = 4.4.

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