1. Electronic structure and Fano antiresonance of chromium Cr(III) ions in alkali silicate glasses.
- Author
-
Taktak, Olfa, Souissi, Hajer, and Souha, Kammoun
- Subjects
- *
ELECTRONIC structure , *CHROMIUM ions , *SILICATES , *LIGANDS (Biochemistry) , *TRANSITION metal compounds - Abstract
The optical properties of the Cr 3+ doped in alkali silicate glasses X 2 O–SiO 2 with different modifier cations X=Li, Na and K have been investigated by Villian et al. This work investigates a theoretical crystal-field analysis of the electronic energy levels of Cr 3+ in these glasses. This analysis based on the Racah theory was carried out for the Chromium (III) center with an O h site symmetry. The objective of this study is to determine the effect of glass matrix modifier on the Racah B , C and crystal-field Dq parameters. The effect of the glass matrix environment on these parameters is also reported by comparison with alkali cadmium borosulphate, phosphate and borate glasses. The interference dips observed in the broad band 4 T 2g ( 4 F) result from interaction with the 2 E g ( 2 G) and 2 T 1g ( 2 G) sharp levels are known as the Fano antiresonance model. This feature is qualitatively studied using the adiabatic potential surfaces for the quartet 4 T 2g ( 4 F) and doublet 2 E g ( 2 G) levels. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF