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Peculiar manifestation of the dipole–dipole interaction between non‐Kramers paramagnetic centers as studied by tunable high‐frequency EPR spectroscopy
Author(s) -
Salikhov K. M.,
Tarasov V. F.
Publication year - 2005
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1683
Subject(s) - chemistry , paramagnetism , electron paramagnetic resonance , dipole , electron paramagnetic resonance spectroscopy , spectroscopy , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , condensed matter physics , atomic physics , stereochemistry , physics , organic chemistry , quantum mechanics
EPR spectral shape of non‐Kramers paramagnetic centers (PCs) is theoretically analyzed under conditions of saturation. The analysis is performed in a model that includes the spectral diffusion process induced by a random modulation of the dipole–dipole interaction of the paramagnetic centers, by reorientations of magnetic moments. It is shown that around zero magnetic field, a ‘hole’ might appear in the EPR spectrum. We have also studied experimentally the saturation behavior of the EPR spectrum in Cr 2+ : Mg 2 SiO 4 . The experimental results are interpreted in the framework of the model considered. By comparing simulated and experimental spectra, the paramagnetic relaxation times and the characteristic rate of the spectral diffusion are estimated. Copyright © 2005 John Wiley & Sons, Ltd.