Parametric analysis of the energy levels of U/sup 4 +/ in D/sub 2d/ and limiting D/sub 2/ sites 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.28.4923· OSTI ID:5476091

Delamoye, P; Rajnak, K; Genet, M; Edelstein, N

Below T/sub c/ = 95 K, U/sup 4 +/:ThBr/sub 4/ exists as an incommensurately modulated structure. The U/sup 4 +/ ions occupy a range of sites which vary from D/sub 2d/ to a limiting D/sub 2/ site. The D/sub 2d/ and limiting D/sub 2/ sites have been identifed spectroscopically. We report a parametric analysis of the U/sup 4 +/ energy levels in both sites. For 26 levels in the D/sub 2d/ site the root-mean-square deviation sigma = 36 cm/sup -1/ and F/sup 2/ = 42 253 +- 127, F/sup 4/ = 40 458 +- 489, F/sup 6/ = 25 881 +- 383, zeta = 1783 +- 7, ..cap alpha.. = 31 +- 1, ..beta.. = -644 +- 75, ..gamma.. = 1200, B/sub 0//sup 2/ = -1096 +- 80, B/sub 0//sup 4/ = 1316 +- 146, B/sub 4//sup 4/ = -2230 +- 85, B/sub 0//sup 6/ = -3170 +- 379, and B/sub 4//sup 6/ = 686 +- 246, all in cm/sup -1/. For 38 D/sub 2/ levels sigma = 39 cm/sup -1/, and those parameters which occur in both symmetries are only slightly changed. The additional parameters which occur only in D/sub 2/ symmetry are B/sub 2//sup 2/ = -78 +- 30, B/sub 2//sup 4/ = 318 +- 122, B/sub 2//sup 6/ = 136 +- 101, B/sub 6//sup 6/ = 123 +- 125, all in cm/sup -1/. F/sup 2/ is 81% of the free-ion value. This decrease in F/sup 2/ is more like that found for 3d than that found for 4f electrons.

• Research Organization: Laboratoire de Radiochimie, Institute de Physique Nucleaire, Bote Postale No. 1, F-91406 Orsay, France
• OSTI ID: 5476091
• 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
ACTINIDE COMPOUNDS
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
CRYSTAL FIELD
CRYSTALS
DIPOLES
ELECTRIC DIPOLES
ENERGY LEVELS
HALIDES
HALOGEN COMPOUNDS
HAMILTONIANS
IONS
MATHEMATICAL OPERATORS
MONOCRYSTALS
MULTIPOLES
PARAMETRIC ANALYSIS
QUANTUM OPERATORS
SELECTION RULES
SPECTROSCOPY
THORIUM BROMIDES
THORIUM COMPOUNDS
URANIUM IONS