Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 163, Issue 1, Pages 46-55Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S1090-7807(03)00058-2
Keywords
separated local field spectroscopy; dipolar couplings; PDLF; PISEMA; liquid crystals
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We are in this work comparing the efficiencies of various H-1-C-13 separated local field (SLF) experiments when applied to columnar and nematic liquid crystals. In particular, the performances of the conventional SLF, proton-detected local field (PDLF), and polarization inversion spin exchange at the magic angle (PISEMA) methods in terms of spectral resolution, robustness, and ability to measure long-range couplings are investigated. The PDLF sequence provides in most cases the best dipolar resolution. This is especially obvious for weakly coupled H-1-C-13 spin pairs. (C) 2003 Elsevier Science (USA). All rights reserved.
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