Abstract
AbstractIsolated paramagnetic Cr+ centres in sodium halide crystals are studied by EPR and ENDOR. They show cubic symmetry. Superhyperfine and quadrupole interactions with many neighbouring ions (up to 〈300〉 in NaF) could be determined. The experimental results are interpreted in terms of two models for the wavefunction of the centre: overlap and covalency. A new way for the experimental determination of the coefficients for σ‐ and π‐covalency, using the isotropic superhyperfine interactions of neighbours 〈110〉 and 〈200〉, is proposed. The small anisotropic superhyperfine interaction of the nearest neighbours, which becomes even negative for Br− in NaBr, cannot be understood along these lines.
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