Free Access
Issue
J. Chim. Phys.
Volume 96, Number 9/10, October/November/December 1999
Page(s) 1543 - 1550
DOI https://doi.org/10.1051/jcp:1999231
DOI: 10.1051/jcp:1999231


J. Chim. Phys. Vol. 96, N°9/10  p. 1543-1550

Theoretical study of electronic relaxation processes in hydrated Gd 3+complexes in solutions

S. Rast1, P.H. Fries1 and E. Belorizky2

1  1Laboratoire Reconnaissance Ionique, Service de Chimie Inorganique et Biologique, Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 38054 Grenoble cedex 9, France
2  Laboratoire de Spectrométrie Physique, Université Joseph Fourier, BP. 87, 38402 Saint-Martin-d'Hères Cedex, France

Abstract
The EPR line widths of [ Gd(H 2O) 8] 3+ measured in water at various magnetic fields by Merbach's group have been reinterpreted. A theoretical model of the transverse electronic relaxation is proposed. All the terms of the static zero-field splitting (ZFS) allowed by the symmetry of the complex are included and shown to have a significant contribution. The influence of a transient distortion ZFS is also studied.

Résumé
On réinterprète les largeurs de raie RPE des ions [ Gd(H 2O) 8] 3+ mesurées dans l'eau à différents champs magnétiques par le groupe de Merbach. On propose un nouveau modèle théorique de la relaxation électronique transverse. On montre que tous les termes statiques du champ cristallin, compatibles avec la symétrie du complexe, jouent un rôle non négligeable. On étudie aussi l'influence des fluctuations rapides de distorsion du complexe.


Key words: zero-field splitting -- Redfield's relaxation theory -- EPR line widths.
Contents

© EDP Sciences 1999

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