1H and31P ENDOR of the isotropic CO2
? signal atg=2.0007 in the EPR spectra of precipitated carbonated apatites |
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| Authors: | P D W Moens F J Callens E R Boesman R M H Verbeeck |
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| Institution: | 1. Laboratory of Crystallography and Study of the Solid State, Krijgslaan 281-S1, B-9000, Gent, Belgium
2. Laboratory for Analytical Chemistry, Gent, Belgium
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| Abstract: | The isotropic EPR signal atg=2.0007 in X-irradiated carbonated apatites, precipitated from aquaeous solutions and dried at 25°C, is investigated with Electron Nuclear Double Resonance (ENDOR). The23Na,31P and1H ENDOR results indicate that the precursor of this radical is most probably located in an aqueous phase entrapped between the crystallites (the so-called occluded water). Other experimental features, such as the correlation between the appearance of the signal in the EPR spectrum and the presence of some residual (adsorbed and/or occluded) water in the sample seem to strengthen our hypothesis. |
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