Eur. Phys. J. Appl. Phys.
Volume 24, Number 3, December 2003
|Page(s)||209 - 213|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||16 September 2003|
Crystal-field analysis of the Cr4+ absorption and excitation spectrum in LiGaO2 oxide crystal
Groupe de Physique Théorique, Département de Physique, Faculté des Sciences de Sfax, BP 802, 3018 Sfax, Tunisia
Corresponding author: Souha.Kammoun@fss.rnu.tn
Revised: 17 April 2003
Accepted: 20 June 2003
Published online: 16 September 2003
The absorption and excitation spectra of the tetrahedrally coordinated Cr4+ ions doped in LiGaO2 oxide crystal are measured by Kück and Hartung at room temperature. Using the experimentally determined data from these spectra, a theoretical calculation for the crystal-field levels of Cr4+:LiGaO2 was performed by Kück and Hartung, based on the angular overlap model theory (AOM). The calculation reveals an important discrepancy between the theoretical and the experimental energies. A detailed crystal-field analysis of electronic energy levels of Cr4+ doped in LiGaO2 oxide crystal based on the Racah theory is proposed in this work. The observed crystalline-field splitting of the Cr4+ terms was accounted for using a C1 symmetric Hamiltonian. In turn, reliable crystal-field and Racah parameters have been obtained. This theoretical analysis confirms the observed crystalline-field splittings of the 3F and 3P terms of the Cr4+ ion doped in the oxide crystal LiGaO2.
PACS: 71.70.Ch – Crystal and ligand fields / 72.80.Ga – Transition-metal compounds / 76.30.Fc – Iron group (3d) ions and impurities (Ti-Cu)
© EDP Sciences, 2003
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