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Combining PGSE NMR with Homonuclear Dipolar Decoupling

✍ Scribed by S.V Dvinskikh; I Furó

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
97 KB
Volume
144
Category
Article
ISSN
1090-7807

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✦ Synopsis

A new robust approach for combining multiple-pulse homonuclear decoupling and PGSE NMR is introduced for accurately measuring molecular diffusion coefficients in systems with nonvanishing static homonuclear dipolar couplings. Homonuclear decoupling suppresses dipolar dephasing during the gradient pulses but its efficiency and scaling factor for the effective gradient vary across the sample because of the large variation of the frequency offset caused by the gradient. The resulting artifacts are reduced by introducing a slice selection scheme. The method is demonstrated by 19 F PGSE NMR experiments in a lyotropic liquid crystal.

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