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

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 t_iu‐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.