Document 
Eur. Phys. J. Appl. Phys. 24, 209-213 (2003)
DOI: 10.1051/epjap:2003065
Crystal-field analysis of the Cr
absorption and excitation
spectrum in LiGaO
oxide crystal
S. Kammoun and M. Kamoun Groupe de Physique Théorique, Département de Physique, Faculté des Sciences de Sfax, BP 802, 3018 Sfax, Tunisia Souha.Kammoun@fss.rnu.tn
(Received: 1st February 2003 / Received in final form: 17 April 2003 / Accepted: 20 June 2003 Published online: 16 September 2003)
Abstract
The absorption and excitation spectra of the tetrahedrally coordinated Cr
4+ ions doped in LiGaO
2 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 Cr
4+:LiGaO
2 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 Cr
4+ doped in LiGaO
2 oxide crystal based on the Racah
theory is proposed in this work. The observed crystalline-field splitting of the Cr
4+ terms
was accounted for using a C
1 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 Cr
4+ ion doped in the oxide
crystal LiGaO
2.
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