Abstract
Natural samples often exhibit isotropic electron spin resonance (ESR) signals at g=2.0006 ( CO2-) and g=2.0057 ( SO2-). Electron nuclear double resonance (ENDOR) data were collected for various calcitic or aragonitic samples of marine origin. The small and isotropic 1H hyperfine ENDOR splitting (250–350 kHz) is explained by a locally disordered water environment for these species. As for the isotropic CO2- and CO3- radicals in synthetic monohydrocalcite and apatite, the radicals are most probably located in the occluded water embedded in these samples, and not in the crystal matrix.
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