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

Gruber, John B.; Hills, Marian E.; Morrison, Clyde A.; Turner, Gregory A.; Kokta, Milar R.

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

Active / Technical Report | Accession Number: ADA193634 |

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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.

Author(s):

Gruber, John B. ; Hills, Marian E. ; Morrison, Clyde A. ; Turner, Gregory A. ; Kokta, Milar R.

Author Organization(s):

HARRY DIAMOND LABS ADELPHI MD

Descriptive Note:

Interim rept. Oct 86-Jun 87,

Pagination:

0036

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:

Approved For Public Release

RECORD

Collection: TR

Identifying Numbers

Report Number(s):

HDL-TR-2136

Subject Terms

Joint Capability Areas:

JCA_5_Command and Control; JCA_1.2.3_Educating; JCA_5.3_Planning; JCA_5.2_Understand; JCA_1.3.2_Personnel Management; JCA_4.6_Engineering; JCA_1.2.5_Lessons Learned

Modernization Areas:

Quantum Science and Computing; Space

Communities of Interest:

Energy and Power Technologies

Descriptor(s):

*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

Field(s)/Group(s):

Inorganic Chemistry

Keyword(s):

LPN HDL 590751, PE61102A

Report Date:

1988 Mar 01