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The importance of precise timing in pulsed, rotor-synchronous MAS NMR

✍ Scribed by Joel R. Garbow; Terry Gullion

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 457 KB
Volume: 192
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85430-i

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✦ Synopsis

Magic-angle spinning NMR experiments with synchronously applied pulse trains are used to measure a variety of different anisotropic interactions, such as heteronuclear dipolar couplings and chemical-shift anisotropies. When the sample rotation speed and the pulse-sequence timings are not properly synchronized, the resulting spectra may contain artifacts and anisotropic interactions may be measured incorrectly. Sample-rotation/pulse-sequence asynchrony can result from short-term fluctuations in spinning speed, even when the average spinning speed is carefully regulated. Here we examine three simple, spin-echo pulse sequences under conditions where the pulse trains are incommensurate with the sample rotation.

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