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

Personal Author(s) : Gruber, John B ; Hills, Marian E ; Morrison, Clyde A ; Turner, Gregory A ; Kokta, Milar R

PDF Url : ADA193634

Report Date : Mar 1988

Pagination or Media Count : 36

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 35,000/cm 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 1.7/cm, for Gd3+ (with 14 levels) is 4/cm, and for Cr3+ (with 35 levels) is 87.7/cm. 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.

Descriptors :   *ABSORPTION SPECTRA, *CHROMIUM, *GADOLINIUM, *NEODYMIUM, CRYSTALS, ELECTRIC FIELDS, ENERGY LEVELS, FIELD THEORY, HAMILTONIAN FUNCTIONS, LIQUID NITROGEN, RARE EARTH ELEMENTS, ROOM TEMPERATURE, THEORY, TRANSITION METALS, VALENCE

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE