Accession Number:

ADA193634

Title:

Absorption Spectra and Energy Levels of Gd(3+), Nd(3+), and Cr(3+) in the Garnet Gd3Sc2Ga3O12.

Descriptive Note:

Interim rept. Oct 86-Jun 87,

Corporate Author:

HARRY DIAMOND LABS ADELPHI MD

Report Date:

1988-03-01

Pagination or Media Count:

36.0

Abstract:

Absorption spectra recorded between 0.3 and 6.7 micro are reported for trivalent gadolinium, trivalent neodymium, and trivalent chromium in single-crystal gadolinium scandium gallium garnet, Gd3Sc2Ga3O12, at liquid nitrogen, and room temperatures. Crystalline electric-field-split energy levels are established from data between 1,5000 and 35,000cm for Gd3 4f7, Nd3 4f3, and cr3 3d3. The Gd3 and Nd3 ions occupy sites having D2 point symmetry Cr3 ions are found primarily in sites of C3i point symmetry. A Hamiltonian consisting of Coulombic, spin-orbit, and crystalline electric-field terms, having symmetry appropriate to each ion, is diagonalized to obtain theoretic energy levels. The rms deviation between calculated and observed levels for Nd3 with 45 levels is 1.7cm, for Gd3 with 14 levels is 4cm, and for Cr3 with 35 levels is 87.7cm. A lattice su, calculation is compared with the phenomenological parameters obtained from fitting the observed energy levels. Keywords Spectra, Rare earth, Gadolinium, Neodymium, Chromium, Transition metal, Crystal field theory.

Subject Categories:

  • Inorganic Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE