Abstract
The EPR-spectra of the2S1/2-state of Pb3+-ions in different host lattices are characterized by a pronounced hyperfine splitting constantA, a smallg-shift from the free spin valuege and an appreciable amount of superhyperfine interaction. The unpaired 6s-electron of the Pb3+-ion is predominantly found in molecular orbitals built from the central 6s-function and orbitals of the sorrounding ligand ions. This assumption leads to correct estimates of theg-shift (Watanabe theory) and the reduction ofA due to covalent bonding effects. Theg- andA-values are shown to be correlated.
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