SYSTEMATIC STUDY OF THE CRYSTAL FIELD OF CAF2.
Abstract
Crystals of CaF2 containing transition metal ions and crystals of CdF2 containing transition metal and rare-earth ions were grown and the spectra measured. The transition metal ions are either not fluorescent or have only broad fluorescent bands. The ions in the first half of the 3d series prefer the 3+ oxidation state and were found to have large Dq values (1/1000 to 1/1500 cm), whereas those in the latter half of the series prefer the 2+ oxidation state and have Dq values less than 1/500 cm. The rareearth ions all go into CdF2 in the 3+ oxidation state and apparently cannot be reduced to the 2+ state. The absorption and fluorescent spectra of the CdF2 rare-earth-doped crystals are typical of those seen for rare-earth ions in many other crystals. The linewidths of the narrow fluorescent lines in CaF2:Tm(++) and CaF2:Dy(++) were studied both by conventional spectrographic, interferometric, and optical magnetic resonance methods. The temperature dependence of the widths and shifts are discussed and a semi-quantitative interpjetation is given. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 20, 1964
- Accession Number
- AD0446246
Entities
People
- Herbert A. Weakliem
Organizations
- Sarnoff Corporation