HAL : jpa-00232107, version 1

DOI : 10.1051/jphyslet:019820043017065500

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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

Domaine

:

Physique/Articles anciens Physique/Physique/Chimie-Physique

Mots Clés : 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

jpa-00232107, version 1

http://hal.archives-ouvertes.fr/jpa-00232107

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Contributeur : Archives Journal de Physique <>

Soumis le : Vendredi 1 Janvier 1982, 08:00:00

Dernière modification le : Jeudi 6 Mars 2008, 20:30:29