Far-Off-Resonance Averaging of Dipolar Interactions in Solids

✍ Scribed by I. Chang; G. Diezemann; G. Hinze; R. Böhmer; H. Sillescu

• Book ID: 102598833
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 202 KB
• Volume: 124
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1996.1023

✦ Synopsis

The far-off-resonance performance of several line-narrowing serobust against various pulse imperfections, multiple-pulse quences is investigated. Both theoretically and experimentally, it sequences are usually considered to require carefully adis found that transverse relaxation times, dominated by dipolejusted spectrometers.

dipole interactions, are most effectively prolonged not only on-

Recently it has been shown that the MREV sequence can resonance but also for certain, generally large, resonance offsets. also be used in strongly inhomogeneous magnetic fields to These correspond to a situation when, during the basic pulse sepayield an up to 20-fold prolongation of the effective T 2 (9).

ration, the frequency offset rotates the toggling-frame Hamiltonian

This observation, which then allowed diffusion studies to be by multiples of 180Њ. The implications of these results for the study carried out well in the solid state, is quite remarkable, if one of macroscopic translational diffusion using static-field-gradient recalls that the Larmor frequency variation across the excited NMR are discussed.