Comparative crystal field study of Ni2+ energy levels and crystal field effects in CsCdBr3 and CsMgBr3 crystals
| Autor: | Mikhail G. Brik, A.A. Chaykin |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Field (physics)
Absorption spectroscopy Chemistry Hydrostatic pressure Biophysics Physics::Optics General Chemistry Crystal structure Condensed Matter Physics Biochemistry Molecular physics Atomic and Molecular Physics and Optics Crystal Crystallography symbols.namesake Crystal field theory Condensed Matter::Superconductivity Stokes shift symbols Ground state |
| Zdroj: | Journal of Luminescence. 145:563-568 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2013.08.037 |
| Popis: | The exchange charge model of crystal field theory has been used to analyze the ground state absorption of Ni2+ ions in CsCdBr3 and CsMgBr3 crystals. The parameters of crystal field were calculated from the available crystal structure data. The obtained Ni2+ energy level schemes were compared with the experimental absorption spectra; good agreement between the calculated and experimental data was demonstrated. Dependencies of the crystal field strength 10Dq on the “impurity ion—ligand” distance of the nearest Br− ions from Ni2+ ions were derived for both crystals and used to estimate the Stokes shift values for these crystals; all calculated results are close to the experimental data. The “critical” Ni–Br distances leading to the Ni2+ energy levels crossing were estimated; these results can be used for the analysis of the external hydrostatic pressure effects on the optical properties of the studied crystals. |
| Databáze: | OpenAIRE |
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