Optical absorption and Zeeman studies of Co2+ions in CdCl2

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Abstract
A detailed analysis of the electronic and vibronic structure in the absorption spectrum of CdCl2:Co2+ single crystals near 18800 cm-1 is presented. Sharp features in the spectrum which have been attributed by earlier workers to pure electronic transitions are shown to be vibronic in origin and due to a local vibrational model at the Co2+ site. Zeeman studies in magnetic fields up to 13 T applied perpendicular and parallel to the trigonal c-axis have yielded g-values within the 2T1g(2H) multiplet. Comparison with earlier studies of the isomorphous system CdBr2:Co2+ indicates that, unlike the bromide, the wavefunctions of the trigonal-field-split Gamma 8+ level in 2T1g(2H) remain nearly pure octahedral in the chloride.