Numéro |
J. Phys. I France
Volume 6, Numéro 1, January 1996
|
|
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Page(s) | 137 - 147 | |
DOI | https://doi.org/10.1051/jp1:1996133 |
J. Phys. I France 6 (1996) 137-147
Radiofrequency and Mössbauer Spectra of a Paramaghetic Ion in the Presence of Hyperfine Interactions and of Tunnel Effect
Françoise Hartmann-BoutronLaboratoire de Spectrométrie Physique UJF-CNRS, UA 08, Université J. Fourier - Grenoble I, B.P. 87, 38402 Saint Martin d'Hères Cedex, France
(Received 13 July 1995, revised in final form and accepted 2 October 1995)
Abstract
The influence of a coherent tunnel effect on the magnetic hyperfine structure of a diluted
paramagnetic ion, with an electronic ground state
, is studied under the
assumptions of zero longitudinal magnetic field and slow electronic relaxation. It is shown that the
radiofrequency and Mössbauer spectra should be altered, with a change in the number and
intensities of the lines. When the tunnelling parameter,
, is large compared to the
hyperfine structure, the magnetic hyperfine structure splitting should be strongly reduced and it
should vanish for
. Tunnelling effects have already been observed in EPR
experiments on
diluted in diamagnetic matrices. The cases of NMR with
I=3/2 and of
Mössbauer spectroscopy for a transition
are considered.
© Les Editions de Physique 1996