Accession Number:

ADA017849

Title:

Rare Earth Ion-Host Crystal Interactions. 3. Three-Parameter Theory of Crystal Fields.

Descriptive Note:

Technical rept.,

Corporate Author:

HARRY DIAMOND LABS ADELPHI MD

Personal Author(s):

• Leavitt,Richard P.
• Morrison,Clyde A.
• Wortman,Donald E.

Report Date:

1975-06-01

Pagination or Media Count:

45.0

Abstract:

A systematic approach in selecting solid-state materials that offer promise as new lasers with predetermined characteristics is of fundamental importance. Reliable predictions of the energy levels and transition probabilities of a laser active ion in a given host would greatly facilitate this goal. The three-parameter theory of crystal fields is used to derived crystal-field parameters for the first rare-earth series, lanthanides, in CaWO4. The parameters q and eta of the theory describe covalent effects in the host lattice q represents the effective oxygen charge, and eta represents the effective oxygen-tungsten distance. The third parameter tau represents the expansion of the radial 4f wavefunction from its Hartree-Fock value. Values of tau are found for the ions Nd3, Tb3, Dy3, Ho3, Er3, and Tm3, and are determined for the other rare earths by a linear fit. Energy levels and ground state g-values are calculated using the derived crystal-field parameters.

Descriptors:

• *CRYSTAL STRUCTURE
• TUNGSTATES
• NEODYMIUM
• TERBIUM
• DYSPROSIUM
• HOLMIUM
• ERBIUM
• DYSPROSIUM
• CALCIUM COMPOUNDS
• HARTREE FOCK APPROXIMATION
• ENERGY LEVELS
• LASER MATERIALS
• ELECTRON TRANSITIONS

Subject Categories:

• Physical Chemistry
• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE