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Indirect NMR Detection in Solids with Multiple Cross-Polarization Periods

✍ Scribed by A.K. Khitrin; B.M. Fung

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
57 KB
Volume
152
Category
Article
ISSN
1090-7807

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✦ Synopsis

The use of indirect detection for signal enhancement in solids is much less common than in liquids, but has attracted renewed interest recently. In this work we describe an indirect detection scheme that offers a large signal enhancement for rare spins in solids. The method uses multiple periods of cross polarization, each followed by an evolution period. The latter is increased stepwise in a pseudo 2D experiment, in which the signal of the rare spin is detected as modulation of the abundant spin. As an illustration of this method, the natural abundance deuterium NMR spectrum of a static powder sample of 1,2,4,5-tetramethylbenzene is presented.

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