Electron paramagnetic resonance of gamma-irradiation damage centers in fumaric acid dipotassium salt dihydrate

Abstract

Electron paramagnetic resonance spectra of gamma-irradiated single crystals of fumaric acid dipotassium salt dihydrate have been studied for different orientations of the crystal in a magnetic field. The radicals produced by gamma-irradiation have been investigated between 123 and 300 K. The spectra were found to be temperature-independent, and radiation damage centers were attributed to the (< C > over dot)(alpha)H alpha C beta H beta COO-- and (< C > over dot)H=CH2 radicals. The g factor and hyperfine coupling constants were found to be a(alpha) = 16.53; a(beta) = 22; g(ort) = 2.003162; a(CH) = 19; a(CH2) = 11.0; g(av) = 2.0011; rho = 0.66 and rho = 0.76.