Symmetry Selection Rules, and Energy Levels of Pr(3+):Y(3)A1(5)O(12)
Abstract
Absorption, fluorescence, and site-selective excitation spec tra of Pr3+:Y3Al5O12 are reported between 0.4 and 6.7 microns at several temperatures between 1.6 and 90 K. The complexity of the spectra indicates that Pr3+ ions occupy several different sites. The most intense spectra, representing the majority of the Pr3+ ions in dodecahedral lattice sites, are analyzed on the basis of electric-dipole selection rules for D2 site symmetry. Weak spectra are reported but not analyzed because of the difficulty in assigning levels to a particular site. Analyses of intense spectra establish the symmetry of 17 Gamma sub 1, 12 Gamma sub 2, 10 Gamma sub 3, and 12 Gamma sub 4 Stark levels. These 51 levels are compared with the results of a crystal-field splitting calculation. A Hamiltonian consisting of Coulombic, spin-orbit, and crystal-field (D2 symmetry) terms was diagonalized for all manifolds of the Pr3+ (4f2) configuration. The rms deviation between calculated and experimental levels is 11 cm. (jhd)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1989
- Accession Number
- ADA215120
Entities
People
- Clyde A. Morrison
- Gregory A. Turner
- John B. Gruber
- Marian E. Hills
- Roger M. Macfarlane
Organizations
- Harry Diamond Laboratories