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The angular dependence of the electron spin resonance spectrum of Cr3+ and Fe3+ ions in diluted ammonium alum has been measured, and the spin Hamiltonian parameters have been derived. In addition to the allowed fine structure lines some small‐intensity lowfield lines have been observed. These lines were identified as forbidden fine structure transitions due to Cr3+ and Fe3+ in alum. A good agreement between the theoretical angular dependence with that experimentally found confirmed the lines and the local symmetry of the ions to be correctly determined.
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Fǎrcaş et al. (1976) studied this question.
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