✍ Scribed by Mattias Edén
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n pulse sequences [Chem. Phys. Lett. 321 (2000) 205] provide efficient dipolar recoupling in magic-angle spinning nuclear magnetic resonance. For homonuclear and heteronuclear recouplings, we demonstrate analytically, numerically, and experimentally that the dipolar scaling factors may be increased by replacing previously introduced pulse elements of such sequences by windowed ones. In the case of the sequence R14 6 2 , we obtain experimentally 65% faster buildup of 13 C double-quantum coherences in uniformly 13 C-labelled glycine and alanine powders, and a significantly more broadband recoupling. We also discuss the limitations of the proposed windowed pulse sequences and their use in other recoupling scenarios.
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A series of uni-and multidimensional variants of the dipolar exchange-assisted recoupling (DEAR) NMR experiment is described and applied to determinations of 13 C-14 N dipolar local field spectra in amino acids and dipeptides. The DEAR protocol recouples nearby nuclei by relying on differences in th