%0 Journal Article %J Journal of Magnetic Resonance Series A %D 1995 %T Low-Power Decoupling Sequences for High-Resolution Chemical-Shift and Local-Field Nmr-Spectra of Liquid-Crystals %A Nanz, D. %A Ernst, M. %A Hong, M. %A Ziegeweid, M. A. %A Schmidt-Rohr, K. %A Pines, A. %K dipolar %X

Various new and well-established multiple-pulse sequences that provide homonuclear dipolar decoupling are compared on a high-resolution spectrometer/probe configuration using low RF-irradiation powers. Proton-proton decoupled carbon-13 spectra of singly C-13-labeled benzene dissolved in a nematic liquid crystal and of the liquid crystal 152 are presented. Two classes of multiple-pulse sequences are studied that produce either broadband decoupled carbon spectra or separated local-held spectra. Several new approaches for the design of windowless sequences are demonstrated to be valuable in these heteronuclear experiments. They include implementations of the iterative MLEV scheme and the use of 270 degrees pulses. Furthermore, noncyclic propagators have been found that exhibit advantages over closely related cyclic analogues in both classes of decoupling sequences. (C) 1995 Academic Press, Inc.

%B Journal of Magnetic Resonance Series A %V 113 %P 169-176 %8 Apr %@ 1064-1858 %G English %U ://WOS:A1995QW15800005 %N 2 %M WOS:A1995QW15800005 %! Low-Power Decoupling Sequences for High-Resolution Chemical-Shift and Local-Field Nmr-Spectra of Liquid-Crystals %R Doi 10.1006/Jmra.1995.1077