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An Improved Broadband Decoupling Sequence for Liquid Crystals and Solids

✍ Scribed by B.M. Fung; A.K. Khitrin; Konstantin Ermolaev

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
88 KB
Volume
142
Category
Article
ISSN
1090-7807

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✦ Synopsis

Recently we developed an efficient broadband decoupling sequence called SPARC-16 for liquid crystals [J. Magn. Reson. 130, 317 (1998)]. The sequence is based upon a 16-step phase cycling of the 2-step TPPM decoupling method for solids [J. Chem. Phys. 103, 6951 (1995)]. Since then, we have found that a stepwise variation of the phase angle in the TPPM sequence offers even better results. The application of this new method to a liquid crystalline compound, 4-n-pentyl-4-cyanobiphenyl, and a solid, L-tyrosine hydrochloride, is reported. The reason for the improvement is explained by an analysis of the problem in the rotating frame.

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