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The absorption spectra at liquid helium temperature of divalent impurities Ti d 2 , V d 3 , Cr d 4 , Co d 7 and Ni d 8 in zinc selenide are presented. Values of the crystal field parameters B and Delta are derived from the spectra. The variation of Delta through the 3d n series has not been explained by present theories: it is suggested that a new approach, based on bond charge, may be more fruitful.
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Wray et al. (1971) studied this question.
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