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Journal de Physique Lettres 43, 17 (1982) 655-663
Optical absorption spectrum of dilute U4+ impurities in incommensurate ThBr4 : lineshape analysis
P. Delamoye1, R. Currat2
(1982)

Crystal-field transitions associated with U4+ impurities diluted in ThBr4 give rise to broad absorption bands characterized by edge singularities. We show that the experimental spectra are consistent with the known occurrence of a sinusoidal distortion which modulates the Br- ion equilibrium positions, thus reducing the actinide site-symmetry from D2d to D2. The observation of spectral singularities corresponding to D2d-sites is interpreted as resulting from the partial pinning of the incommensurate modulation by the U4+ impurities.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  ILL - Institut Laue-Langevin
Physique/Articles anciens

Physique/Physique/Chimie-Physique
crystal field interactions – impurity and defect absorption spectra of inorganic solids – spectral line breadth – thorium compounds – uranium – optical absorption spectrum – crystal field transitions – dilute U sup 4+ impurities – incommensurate ThBr sub 4 – lineshape analysis – edge singularities – sinusoidal distortion – Br sup ion equilibrium positions – actinide site symmetry – spectral singularities – partial pinning – incommensurate modulation
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