Heteronuclear dipolar recoupling in solid-state nuclear magnetic resonance by 
amplitude-, phase-, and frequency-modulated Lee-Goldburg cross-polarization

Dvinskikh, Sergey V.; Zimmermann, Herbert; Maliniak, Arnold; Sandström, Dick

doi:10.1063/1.1834569

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Heteronuclear dipolar recoupling in solid-state nuclear magnetic resonance by amplitude-, phase-, and frequency-modulated Lee-Goldburg cross-polarization

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Zimmermann, Herbert
Department of Biomedical Optics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Dvinskikh, S. V., Zimmermann, H., Maliniak, A., & Sandström, D. (2005). Heteronuclear dipolar recoupling in solid-state nuclear magnetic resonance by amplitude-, phase-, and frequency-modulated Lee-Goldburg cross-polarization. The Journal of Chemical Physics, 122(4): 044512, pp. 1-12. doi:10.1063/1.1834569.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-6D03-3

Abstract

This paper presents a theoretical, numerical, and experimental study of phase- and frequency-switched Lee-Goldburg cross-polarization (FSLG-CP) under magic-angle spinning conditions. It is shown that a well-defined amplitude modulation of one of the two radio-frequency (rf) fields in the FSLG-CP sequence results in highly efficient heteronuclear dipolar recoupling. The recoupled dipolar interaction is gamma-encoded and, under ideal conditions, the effective spin Hamiltonian is equivalent to that in continuous-wave Lee-Goldburg CP. In practice, however, FSLG-CP is less susceptible to rf field mismatch and inhomogeneity, and provides better suppression of (1)H spin diffusion. The performance of FSLG-CP is experimentally demonstrated on liquid-crystalline samples exhibiting motionally averaged dipolar couplings.