OPTICAL SPECTRUM OF CR(3+) IONS IN SPINELS,
Abstract
The optical absorption and fluorescence spectra of two spinels, ZnAl2O4:Cr(3+) and MgAl2O4:Cr(3+), were measured at temperatures between 4.2K and room temperature, and the data are fitted to a crystal field theory that includes spin-orbit coupling and the trigonal field of the D3 site. The parameters for a best fit for both crystals are: Delta = 18,250/cm, zeta = 250/cm, v = -200/cm, v' = -1700/cm, and k = 0.7. The (2)E and (4)A2 splittings, observed directly in the ZnAl2O4:Cr(3+) spectrum, are satisfactorily accounted for by the theory. The intensity of the R-lines is shown to be due to magnetic dipole transitions, and fluorescence lifetimes agree well with calculated values. Vibrational sidebands and pair lines observed in fluorescence are identified. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1968
- Accession Number
- AD0668446
Entities
People
- D. L. Wood
- D. M. Larkin
- G. F. Imbusch
- P. P. Kisliuk
- R. M. Macfarlane
Organizations
- The Aerospace Corporation