EPR study of gamma irradiated DL-methionine sulfone single crystals

Electron paramagnetic resonance (EPR) study of gamma irradiated dl-2-amino-4-(Methylsulfonyl) butyric acid (dl-methionine sulfone, hereafter dl-ABA) single crystals and powder was performed at room temperature. It has been found that this compound indicates the existence of C. O₂^- and N. H₂ radicals after γ-irradiation. While g and hyperfine splitting values for the N. H₂ radical were observed, for the C. O₂^- radical, only the g factor was measured. The EPR spectra have shown that N. H₂ radical has two groups each having two distinct sites and C. O₂^- radical has one site. The principal g and hyperfine values for all sites were analyzed.