Accession Number:

ADA180746

Title:

Absorption Spectra and Energy Levels of Sm3+:Y3Al5O12.

Descriptive Note:

Final rept. Jan 85-Aug 86,

Corporate Author:

HARRY DIAMOND LABS ADELPHI MD

Report Date:

1987-04-01

Pagination or Media Count:

29.0

Abstract:

Absorption spectra between O.2 and 6.7 micrometer are reported for trivalent samarium in single-crystal yttrium aluminum garnet, Y3Al5O12, at liquid nitrogen, and room temperatures. Energy levels 4f5SLj associated with sextet, quartet, and doublet states of Sm32 are established from data between 1,500 and 46,000 cm. Most samarium ions occupy yttrium ion sites, which have D2 point-group symmetry in the lattice. A free-ion wavefunction calculation predicts the assignment of 35 isolated SLj manifolds with an rms deviation of 32 cm between calculated and observed centers of gravity. A Hamiltonian consisting of coulombic, spin-orbit, and crystalline electric field D2 symmetry terms is diagonalized for the two lowest sextet states 6Hj and 6Fj. The calculated Stark levels based on a single set of Kkm crystal field parameters are compared to the observed levels 54, yielding an rms deviation of 4.9 cm. Keywords Spectra, rare earth, samarium, yttrium, alumimum.

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE