Abstracts 1997

Abstract of Publication No. 292

Thomas C. Brunold, Hans U. Güdel and Enrico Cavalli
Optical spectroscopy of Ni2+ doped crystals of Zn2SiO4
Chem. Phys. Lett. 268, 413-420 (1997)      Full Text (PDF)      DOI-Link     

Abstract: The polarized 15 K absorption spectra of Zn2SiO4 doped with Ni2+ consist of three-band systems in the near-infrared (NIR) and visible (VIS) spectral regions centered at 4700, 8500, and 16500 cm1, respectively. In the tetrahedral approximation they are assigned to the d d transitions 3T1 3T2, 3A2, and3 T1 (P), respectively. The spectra are interpreted in terms of a Td C2v site distortion and analyzed using the angular overlap model. The ligand field parameter 10Dq is 4500 cm1, and the Racah parameters B and C are 780 and 3630 cm1, 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 3T1 3 T2, 3A2 absorptions to Ni2+ ions occupying the two crystallographically inequivalent Zn2+ sites of Zn2SiO4.

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