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An Efficient Broadband Decoupling Sequence for Liquid Crystals

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Abstract:

A new and efficient broadband decoupling sequence is presented. It is based on the phase cycling of two pulses with small phase angles. The pulse width is 180° ± 30°, and the phase angle is ±10°–12°. The sequence contains 16 elements, and is called SPARC-16 as an abbreviation forsmallphaseanglerapidcycling. The application of this sequence to a liquid crystalline compound, 4-n-pentyl-4′-cyanobiphenyl (5CB), is reported. The signal-to-noise ratios and the linewidths of the13C peaks of 5CB with SPARC-16 decoupling and with other decoupling methods are compared. The results show that the broadband decoupling efficiency of SPARC-16 is considerably better than those of other methods.

Keywords: SPARC-16; broadband decoupling; liquid crystals

Document Type: Research Article

Affiliations: Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma, 73019-0370

Publication date: February 1, 1998

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