Far-off-resonance averaging of dipolar interactions in solids
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Date
1997
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Academic Press
Abstract
The far-off-resonance performance of several line-narrowing sequences is investigated. Both theoretically and experimentally, it is found that transverse relaxation times, dominated by dipole–dipole interactions, are most effectively prolonged not only on-resonance but also for certain, generally large, resonance offsets. These correspond to a situation when, during the basic pulse separation, the frequency offset rotates the toggling-frame Hamiltonian by multiples of 180°. The implications of these results for the study of macroscopic translational diffusion using static-field-gradient NMR are discussed.
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Chang, I.; Diezemann, G.; Hinze, G.; Böhmer, R.; Sillescu, H.: Far-off-resonance averaging of dipolar interactions in solids. Journal of Magnetic Resonance Nr. 1, Jg. 124(1997), S. 165-171, doi: 10.1006/jmre.1996.1023.