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 range of MAS frequencies without the need of reoptimization. This feature greatly enhances their applicability on spectrometers operating at differing external fields where the MAS frequency needs to be adjusted to avoid detrimental resonance effects.

Bayerisches NMR Zentrum 85747 Garching Germany

Department of Chemistry Faculty of Science Charles University Albertov 6 12842 Prague Czech Republic

Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt 85764 Neuherberg Germany

Munich Center for Quantum Science and Technology Schellingstr 4 D 80799 München Germany

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