Site-selective excitation of U/sup 4 +/ diluted in incommensurate ThBr/sub 4/

Journal Article · Tue Nov 01 04:00:00 EST 1983 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.28.4913· OSTI ID:5484916

Delamoye, P; Krupa, J C; Conway, J G; Edelstein, N

Selective-excitation experiments in the visible region are reported for the U/sup 4 +/:ThBr/sub 4/ system. These permit the classification of absorption and emission lines to the sites found in the incommensurately modulated structure of ThBr/sub 4/. The lines are assigned to a D/sub 2d/ (B) site, a continuous distribution of D/sub 2/ (C) sites, and to the limiting D/sub 2/ (A) site. By application of the model of Delamoye and Currat (J. Phys. (Paris) Lett. 43, L655 (1982)), the energy levels have been mapped as a function of the phase angle phi/sub l/ of the distortion. The agreement between the predictions of the model and experiment is very good. It is shown that the incommensurate structure of ThBr/sub 4/ must be of higher order than q/sub s//c( = (4/13) (where q/sub s/ is a modulation wave vector and c( is one of the basis vectors of the reciprocal lattice of the tetragonal unit cell).

• Research Organization: Laboratoire de Radiochimie, Institute de Physique Nucleaire, Universite de ParisSud, Bote Postale 1, F-91406 Orsay, France
• OSTI ID: 5484916
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 28:9; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTRA
ACTINIDE ALLOYS
ACTINIDE COMPOUNDS
ALLOYS
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
CRYSTAL FIELD
CRYSTAL STRUCTURE
EMISSION SPECTRA
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
HALIDES
HALOGEN COMPOUNDS
IONS
SPECTRA
THORIUM BROMIDES
THORIUM COMPOUNDS
URANIUM ADDITIONS
URANIUM ALLOYS
URANIUM IONS