Temperature dependence of the electron spin resonance spectrum of the CH(2)CO(2)- radical formed in x-irradiated zinc acetate dihydrate.

Abstract

A decrease of one to six gauss (depending on magnetic field orientation) in the coupling constants of the CH₂CO₂⁻ radical formed in X-irradiated zinc acetate dihydrate has been observed over a temperature range of about -60°C to +30°C. Calculations of dipolar and Fermi contact interaction based on a model of internal rotation of the methylene group about the C-C bond have shown a small coupling constant decrease on the order of 0.19 gauss over a temperature range of -150°C to +90°C. The major effect has been shown to be due to a spin relaxation mechanism. The effect was calculated using Monte Carlo techniques, the results of which were confirmed by experimental data.