Abstract
Absorption spectra of (3d)9→(3d)9 electronic transition have been investigated for Cu2+ ions in LiNbO3 crystals at 16-340 K. A triplet structure is observed for the absorption band due to the 2Eg→2T2g transition in a crystal with 0.05 at.% Cu2+ ions, while a doublet structure is observed in a crystal with 0.5 at.% Cu2+ ions. It is suggested that such a difference is due to a different site symmetry of Cu2+ ion because the location of Cu2+ ions in LiNbO3 single crystals depends on the crystal growth conditions.
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