Abstract
The polarized 15 K absorption spectra of Zn 2SiO 4 doped with Ni 2+ consist of three-band systems in the near-infrared (NIR) and visible (VIS) spectral regions centered at 4700, 8500, and 16500 cm −1, respectively. In the tetrahedral approximation they are assigned to the d → d transitions 3 T 1 → 3 T 2 , and 3T 1(P), respectively. The spectra are interpreted in terms of a T d → C 2v site distortion and analyzed using the angular overlap model. The ligand field parameter 10 Dq is 4500 cm −1, and the Racah parameters B and C are 780 and 3630 cm −1, respectively. By the inclusion of spin-orbit coupling in the AOM calculation it is possible to assign the rich fine structure in the origin regions of the 3 T 1 → 3 T 2 , 3A 2 absorptions to Ni 2+ ions occupying the two crystallographically inequivalent Zn 2+ sites of Zn 2SiO 4.
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