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Abstract
Optical properties of Pb ++ ion doped CdI 2 crystal having the layer structure have been studied at low temperature. Absorption spectrum consists of two narrow bands at 3860A and 3830A which are active for E // C and E ⊥ C , respectively. These bands are assigned as due to the allowed transitions from the A 1 g ground state to the excited A 2 u and E u states of Pb ++ ion in the crystal field of D 3 d symmetry. Emission spectrum consists of two narrow bands at 3900A and 3970A and a broad band at 5I80A. The 3900A band emission is polarized parallel to the C -axis. The narrow emission bands have the mirror image relations with absorption bands. Both emission and absorption bands show the complex phonon structures. The main phonons relevant to the structures have energies 16, 49, 64, 70 and 100cm -1 and the last one appears most prominently.
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