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Electron paramagnetic resonance has been observed at single crystals of calcium tungstate doped with lead. After exposure to X‐ray irradiation at the temperature of liquid air paramagnetic centres appear. One group of lines originates from the Vk‐centre in the tungstates. The resonance of Pb3+ ions at Ca2+ sites is reported. This spectrum is characterized by a pronounced hyperfine interaction of the unpaired 6s electron of the Pb3+ ion with the nuclear magnetic moment of the Pb207 isotope. Superhyperfine interaction with four surrounding tungsten nuclei is observed indicating covalent bonding effects with the tungstate groups as ligands and a treatment of the complex in terms of molecular orbitals is proposed. The thermal annealing of the centres detected by EPR is correlated with the thermoluminescence glow curve.
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Born et al. (1970) studied this question.
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