A study of 3d→4s transitions by modulation spectroscopy

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Abstract
In order to gain further information on the 3d→4s transitions 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 by tiu‐type modes and the intensity comes from the nearby 3d→4p transitions; the zeroth moment of linear dichroism is heavily dependent upon the modification by the crystal of the vibronic matrix elements connecting the 4p and 4s states. The orthorhombic perturbation parameters of the 3dn−14s states in MgF2 host are not the same as those of the 3dn states. The symmetry assignments of the 3dn−14s states are confirmed.