Multifrequency electron paramagnetic resonance of Ce3+ in the Gd(HBPz3)2 tropolonate complex: high-field effects. (Articolo in rivista)

Type
Label
  • Multifrequency electron paramagnetic resonance of Ce3+ in the Gd(HBPz3)2 tropolonate complex: high-field effects. (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • F.F. Popescu; M. Martinelli; C.A. Massa; L.A. Pardi; V. Bercu (2005)
    Multifrequency electron paramagnetic resonance of Ce3+ in the Gd(HBPz3)2 tropolonate complex: high-field effects.
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • F.F. Popescu; M. Martinelli; C.A. Massa; L.A. Pardi; V. Bercu (literal)
Pagina inizio
  • 5563 (literal)
Pagina fine
  • 5575 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 17 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Università di Bucarest, Consiglio Nazionale delle Ricerche. (literal)
Titolo
  • Multifrequency electron paramagnetic resonance of Ce3+ in the Gd(HBPz3)2 tropolonate complex: high-field effects. (literal)
Abstract
  • An electron paramagnetic resonance (EPR) powder spectrum investigation of rare earth trace impurities in the Gd(HBPz(3))(2) tropolonate complex (GdTrp) was carried out at 95, 190, and 285 GHz. Ce3+, ion impurities were identified by EPR transitions between levels of the two lowest-lying doublets of the ground J = 5/2 manifold. An important frequency and magnetic-field dependence of the g-factor was observed. The system was successfully described by a Hamiltonian appropriate for tetragonal symmetry without orthorhombic distortion. Compared to conventional microwave EPR spectroscopy, at high fields these effective g-values depend not only on the polar angle between the magnetic field B and the tetragonal axis, but also on the azimuthal angle phi between B and the binary axes of the molecular complex. These dependences include additional terms proportional to (B)(2m), (cos4 phi)(n), where m >= n are natural numbers. They show that in the present experiment, the Zeeman interaction is comparable with the zero-field splitting of the ground manifold. It is found that the second, and the third doublet are located at 13.98 +/- 0.25 cm(-1) and 9.32 +/- 0.15 cm(-1) above the first one, respectively. (literal)
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