Theory of isotopic effects in the optical spectra of lanthanide ions in crystals

Boris Z. Malkin; S. K. Saikin

doi:10.1117/12.229145

3 January 1996 Theory of isotopic effects in the optical spectra of lanthanide ions in crystals

Boris Z. Malkin, S. K. Saikin

Proceedings Volume 2706, Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transitional-Metal Ions; (1996) https://doi.org/10.1117/12.229145
Event: Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare Earth and Transitional Ions, 1995, St. Petersburg, Russian Federation

Abstract

Physical mechanisms contributing to the isotopic structure of spectra of the insulating activated crystals induced by the isotopic disorder in the host crystal or in a system of the impurity optical centers is considered. The microscopic theory of the geometrical anharmonic isotopic effect is presented. We show that the local deformation due to a mass defect in the crystal lattice is dominant in the formation of the fine specific spectral structure in crystals with the proper inhomogeneous isotopic composition (such as ⁶Li_c⁷Li_1-cYF₄:Ho with the natural abundance of c equals 7.42% of the ⁶Li isotope). It contributes essentially to the observed shifts of the spectral lines in the case of different masses of the active optical centers (such as ¹⁶⁴Er, ¹⁶⁶Er, ¹⁶⁸Er and ¹⁷⁰Er isotopes in the LiYF₄ crystal) as well. Detailed calculations of crystal field parameters and of their first and second derivatives with respect to the lattice strains for the impurity lanthanide ions in lithium-yttrium double fluorides are performed within the framework of the exchange charge model and used in the estimations of the different contributions to the isotope-induced shifts of the Stark sublevels.

Citation Download Citation

Boris Z. Malkin and S. K. Saikin "Theory of isotopic effects in the optical spectra of lanthanide ions in crystals", Proc. SPIE 2706, Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transitional-Metal Ions, (3 January 1996); https://doi.org/10.1117/12.229145

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