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EPR and optical spectroscopy of Yb3+ ions in CaF2: an analysis of the structure of tetragonal centers.
- Source :
- Applied Magnetic Resonance; Mar2004, Vol. 26 Issue 4, p617-632, 16p
- Publication Year :
- 2004
-
Abstract
- CaF<subscript>2</subscript> crystals doped with Yb<superscript>3+</superscript> ions have been studied by electron paramagnetic resonance (EPR) and optical spectroscopy. EPR spectra of paramagnetic centers (PCs) for cubic (T<subscript>c</subscript>) and tetragonal (T<subscript>tet</subscript>) symmetries were identified. Empirical energy level diagrams were established and crystal field parameters were determined. Information on the CaF<subscript>2</subscript>∶Yb<superscript>3+</superscript> phonon spectra was obtained from the electron-vibrational structure of the optical spectra. The crystal field parameters were used to analyze the crystal lattice distortions in the vicinity of the Yb<superscript>3+</superscript> ion. Within the framework of a superposition model, it is established that four F<superscript>−</superscript> ions located symmetrically with respect to the fourfold axis from the side of the ion-compensator approach the impurity ion and deviate from the PC axis. The second set of four fluorine ions also approaches the Yb<superscript>3+</superscript> ion and the PC axis. The ion-compensator F<superscript>−</superscript> also approaches considerably the impurity ion. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09379347
- Volume :
- 26
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Applied Magnetic Resonance
- Publication Type :
- Academic Journal
- Accession number :
- 50400580
- Full Text :
- https://doi.org/10.1007/BF03166587