Abstract
Radiation-induced radicals in sulfite-doped calcite and aragonite were characterized by ESR. Among the many ESR signals produced, only four signals are dependent on the SO 2- 3 concentration; an axial signal ( g ⊥=2.0038 and g|=2.0024) in calcite, and an orthorhombic signal ( g 1=2.0042, g 2=2.0038 and g 3=2.0025), an isotropic signal ( g=2.0034) and an isotropic signal ( g=2.0060) in aragonite. The former two signals exhibit hyperfine structures arising from 33 S (I= 3 2 , 0.75% natural abundance), and are attributed to SO - 3 radicals. The isotropic signal at g=2.0034 in aragonite is considered to be due to rotating SO - 3 radicals. Rotating or tumbling molecules (probably SO - 2) produced by thermal decomposition of SO 2- 3 seem to be responsible for the isotropic signal at f=2.0060.
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Schedule a callMore From: International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry
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