Absorption and emission spectra of U/sup 4 +/ diluted in ThBr/sub 4/ single crystals

Journal Article · Mon Aug 15 04:00:00 EDT 1977 · J. Chem. Phys.; (United States)

OSTI ID:7094899

Genet, M; Delamoye, P; Edelstein, N; Conway, J

The absorption and fluorescence spectra of U/sup 4 +/ diluted in single crystals of ThBr/sub 4/ have been measured at room temperature (77 degreeK) and 4.2 degreeK. The crystal symmetry site of the U/sup 4 +/ ion is D/sub 2d/. Twenty three levels have been assigned and a least-squares fit varying nine parameters (and fixing three parameters) gave a mean energy deviation of 89 cm/sup -1/. The values of the parameters obtained from the best fit are (in cm/sup -1/) F/sup 2/=43 770 +- 797, F/sup 4/=31 302 +- 4 200, F/sup 6/=22 248 +- 2 425, zeta=1719 +- 44, ..cap alpha..=36, ..beta..=-600, ..gamma..=1000, B/sup 2//sub 0/=-919 +- 85, B/sup 4//sub 0/=-305 +- 70, B/sup 4//sub 4/=-825 +- 137, B/sup 6//sub 0/=636 +- 917, and B/sup 6//sub 4/=-1937 +- 202. There does not appear to be a systematic correlation between the crystal field parameters obtained for U/sup 4 +/ in ThBr/sub 4/ and those reported earlier for U/sup 4 +/ in UCl/sub 4/ or in ZrSiO/sub 4/.

• Research Organization: Laboratoire de Radiochimie, Institut de Physique Nucleaire, Universite de Paris-Sud, BP No. 1 91406 Orsay, France
• OSTI ID: 7094899
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ABSORPTION SPECTRA
ACTINIDE ALLOYS
ACTINIDE COMPOUNDS
ALLOYS
ATOMIC IONS
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
CRYSTAL FIELD
EMISSION SPECTRA
ENERGY LEVELS
FLUORESCENCE
HALIDES
HALOGEN COMPOUNDS
IONS
LOW TEMPERATURE
LUMINESCENCE
MEDIUM TEMPERATURE
SPECTRA
THORIUM BROMIDES
THORIUM COMPOUNDS
ULTRALOW TEMPERATURE
URANIUM ADDITIONS
URANIUM ALLOYS
URANIUM IONS