Abstract
The optical spectra of the hexaquochromium (III) ion in the host crystals of C(NH2)3Al(SO4)2·6 H2O and several isomorphs, and in AlCl3·6 H2O, are presented and discussed. The broad-band spectra have been analyzed to determine trigonal field parameters, and these results are confirmed by the analysis of the fine-line spectra. The off-diagonal element of the trigonal field, v′, is shown to be as large in magnitude as v, and therefore to be of considerable importance in the interpretation of polarized spectra. Evidence confirming the dependence of the ground-state splitting D on the parameter v′ is also presented.
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