Optical absorption spectrum of dilute U4+ impurities in incommensurate ThBr4 : lineshape analysis
- 1 January 1982
- journal article
- Published by EDP Sciences in Journal de Physique Lettres
- Vol. 43 (17) , 655-663
- https://doi.org/10.1051/jphyslet:019820043017065500
Abstract
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+ impuritiesKeywords
This publication has 3 references indexed in Scilit:
- NMR lineshape and phase soliton effects in incommensurate Rb2ZnCl4Journal of Physics C: Solid State Physics, 1982
- Observation of a phase transition in ThBr4 and ThCl4 single crystals by far-infrared and Raman spectroscopy studyJournal of Solid State Chemistry, 1981
- Absorption and emission spectra of U4+ diluted in ThBr4 single crystalsThe Journal of Chemical Physics, 1977