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Proceedings Paper

Multiphonon optical bands of Cr3+ ion in sulphide spinels: a pseudo Jahn-Teller model
Author(s): A Al Haroun; Leonid L. Culiuc; V Y Mirovitskii; A N Nateprov; A V Palii; V E Tezlevan; B S Tsukerblat
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Paper Abstract

In this article we report the adiabatic and dynamic solutions of the pseudo Jahn-Teller (JT) problem in the orbital triplet 4T2(t22e) of Cr3+ ion resulting from the combined effect of tetragonal (E) vibrations and trigonal crysatl field in sulphide spinels lattice. We discuss the general properties of the adiabatic surfaces that give a clear qualitative insight on the main features of the optical bands. The shapes of the absorption bands are calculated on basis of the quantum-mechanical solution of the dynamic pseudo JT problem taking into account the effective electric-dipole moment involving odd- parity crystal field potential. Pseudo JT (4A1 + 4E) (direct product) e interaction is shown to produce a complicated structure of the multiphoton optical bands and leads to a specific polarization effect. Calculated shape function for the U-band absorption proves to be in a good agreement with the excitation spectrum of (alpha) - ZnAl2S4 tiospinel doped with chromium ions, the experimentally detected peculiarities of the structure of this band are shown to be an evidence of strong pseudo JT interaction in the excited state.

Paper Details

Date Published: 12 July 2002
PDF: 13 pages
Proc. SPIE 4766, XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions, (12 July 2002); doi: 10.1117/12.475341
Show Author Affiliations
A Al Haroun, Academy of Sciences of Moldova (Moldova)
Leonid L. Culiuc, Academy of Sciences of Moldova (Moldova)
V Y Mirovitskii, Academy of Sciences of Moldova (Moldova)
A N Nateprov, Academy of Sciences of Moldova (Moldova)
A V Palii, Academy of Sciences of Moldova (Moldova)
V E Tezlevan, Academy of Sciences of Moldova (Moldova)
B S Tsukerblat, Academy of Sciences of Moldova (Moldova)


Published in SPIE Proceedings Vol. 4766:
XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metal Ions

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