In order to gain further information on the 3drarr;4stransitions of transition metal ions (V++, Mn++, and Co++) in host crystals both the magnetic circular dichroism (in KMgF3) and the linear dichroism (in MgF2) were studied. A quantitative interpretation of the results shows the following: the transitions are promoted bytiuhyphen;type modes and the intensity comes from the nearby 3drarr;4ptransitions; the zeroth moment of linear dichroism is heavily dependent upon the modification by the crystal of the vibronic matrix elements connecting the 4pand 4sstates. The orthorhombic perturbation parameters of the 3dnminus;14sstates in MgF2host are not the same as those of the 3dnstates. The symmetry assignments of the 3dnminus;14sstates are confirmed.
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