Maximizing efficiency of dipolar recoupling in solid-state NMR using optimal control sequences.

ABSTRACT: Dipolar recoupling is a central concept in the nuclear magnetic resonance spectroscopy of powdered solids and is used to establish correlations between different nuclei by magnetization transfer. The efficiency of conventional cross-polarization methods is low because of the inherent radio frequency (rf) field inhomogeneity present in the magic angle spinning (MAS) experiments and the large chemical shift anisotropies at high magnetic fields. Very high transfer efficiencies can be obtained using optimal control–derived experiments. These sequences had to be optimized individually for a particular MAS frequency. We show that by adjusting the length and the rf field amplitude of the shaped pulse synchronously with sample rotation, optimal control sequences can be successfully applied over a

SUBMITTER: Tosner Z 

PROVIDER: S-EPMC8514097 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature