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A simple magic angle spinning NMR experiment for the dephasing of rotational echoes of dipolar coupled homonuclear spin pairs

✍ Scribed by Terry Gullion; Shimon Vega

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
460 KB
Volume
194
Category
Article
ISSN
0009-2614

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✦ Synopsis

A simple NMR experiment for the dephasing of the rotational echo amplitudes of homonuclear dipolar coupled spin pairs in solids rotating at the magic angles is described. The dephasing is generated by n pulses applied synchronously with the sample rotation. One n pulse per rotor cycle is sufficient to cause an echo decay when the homonuclear dipole interaction is present. The dephasing effect of the ~ pulses is described using Floquet theory. Experimental results obtained on a doubly J3C-labeled alanine are presented and compared with numerical calculations. Effects arising from finite pulse lengths are also demonstrated and discussed.

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