Quadrupolar susceptibility of LiTmF4 crystal and the nature of forbidden 3H6(<Gamma>2)-3F2(<Gamma>2) transition

N. S. Altshuler; Alexander L. Larionov; M. P. Rodionova; A. L. Stolov

doi:10.1117/12.475348

12 July 2002 Quadrupolar susceptibility of LiTmF₄ crystal and the nature of forbidden ³H₆(Γ₂)-³F₂(Γ₂) transition

N. S. Altshuler, Alexander L. Larionov, M. P. Rodionova, A. L. Stolov

Proceedings Volume 4766, XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions; (2002) https://doi.org/10.1117/12.475348
Event: XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, 2001, Kazan, Russian Federation

Abstract

The narrow low intensity line with maximum at (lambda) ^-1 equals 15104 cm^-1 and width (delta) equals 0.7 cm^-1 at T equals 4.2 K have been detected in absorption spectrum of regular LiTmF₄ crystal. The observed line belongs to transition form ground state ³H₆((Gamma) ₂) to lowest level (Gamma) ₂ of ³F₂ term of Tm³⁺(4f¹²) ion. The perturbation, which induces (Gamma) ₂ - (Gamma) ₂ transition, does not break S₄ symmetry of Tm³⁺ sites. The perturbation of this kind is the interaction of Tm³⁺ 4f-electrons with electric field, created by quadrupolar moments of lattice ions, which are induced, int urn, by incident electromagnetic wave. To calculate the components of the quadrupolar moment tensors for ions in LiTmF₄ single crystal, we have formulated and solved the system of self-consistent linear equations. We take into account interactions between all induced dipolar and quadrupolar moments and their interactions with electric fields of incident wave. The calculated transition probailities per second are in qualitative accordance with experimental data.

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N. S. Altshuler, Alexander L. Larionov, M. P. Rodionova, and A. L. Stolov "Quadrupolar susceptibility of LiTmF₄ crystal and the nature of forbidden ³H₆(Γ₂)-³F₂(Γ₂) transition", Proc. SPIE 4766, XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, (12 July 2002); https://doi.org/10.1117/12.475348

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KEYWORDS

Ions

Crystals

Polarizability

Absorption

Thulium

Electromagnetic radiation

Transition metals

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