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Optical evidence of energy level crossing and anticrossing for U4+ diluted in the incommensurate structure of β-ThCl4
Milicic-Tang A., Delamoye P., Krupa J.-C.
Journal de Physique I 1, 6 (1991) 917-930 - http://hal.archives-ouvertes.fr/jpa-00246377
Physique/Articles anciens
Physique/Physique/Chimie-Physique
Optical evidence of energy level crossing and anticrossing for U4+ diluted in the incommensurate structure of β-ThCl4
Anita Milicic-Tang1, Pierre Delamoye1, Jean-Claude Krupa1
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
At low temperatures β-ThCl4 undergoes a structural phase transition (Tc=70 K) to an incommensurate structure which can be described as a transverse sinusoidal displacement of the chloride ion positions in a plane perpendicular to the C4 axis of the crystal. These static, atomic displacements induce a continuous distribution of crystal field strengths acting on U4+ embedded in the host matrix. The peculiar lineshapes recorded on absorption spectra and the apparently continuous character of fluorescence energies observed in selective excitation experiments are consistent with a continuous distribution of U4+ sites. In this paper we report a study of the interactions of Stark energy levels belonging to the 1I6 multiplet of U4+ (in the 19 700-19 500 cm-1 energy range) in a magnetic field. Absorption and selectively excited emission spectra recorded at 4.2 K have been used to build an energy level model. The calculated profile of the absorption bands in a magnetic field B parallel to the 〈111 〉 orientation is compared to the experimental observed ones.
Anglais
1991

Journal de Physique I (J. Phys. I)
Publisher EDP Sciences
ISSN 1155-4304 (eISSN : 1286-4862)
non spécifiée
Articles dans des revues avec comité de lecture
1991
1
6
917-930

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