Abstract
Monomer and dimer paramagnetic lead centres have been identified for the first time by electron paramagnetic resonance (EPR) in electrolytically coloured low-purity KCI:Pb crystals. The monomer Pb-(Rh) centre, with orthorhombic symmetry and local axes (110), (001) and (110), decays completely in darkness and is produced by illumination with visible light. It seems to be related to, but is different from, the so-called Te centres identified in the same samples by their optical and magneto-optical spectra, as well as to the monomer Pb- centres earlier observed by EPR in high-purity KCl:Pb crystals x-ray irradiated at room temperature. The Tr1 and Tr2 trapped electron lead-dimer centres, with axial symmetry around (111), seem to be related to the Td centres identified by magneto-optical measurements.
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