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A study of substitutional disorder in : II. Electron spin resonance and polarization of optical spectra

Electron spin-resonance (ESR) studies of in (CYA) reveal spectra consisting of fine-structure pairs of narrow symmetric lines and fairly broad asymmetric lines, corresponding to ions in sites with ordered and disordered configurations of the second-nearest-neighbour ions, respectively. The polarized intensities of the absorption band and the -line fluorescence, measured with the E-vector of the radiation parallel and perpendicular to the c-axis, are in the ratio . These polarization ratios suggest that the octahedra undergo an angular distortion such that the magnetic -axis of the spectrum is rotated away from the crystal c-axis. The microstructure of the surrounding is discussed in terms of the ESR and polarization results.