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  • Title: High-resolution, >1 GHz NMR in unstable magnetic fields.
    Author: Lin Y, Ahn S, Murali N, Brey W, Bowers CR, Warren WS.
    Journal: Phys Rev Lett; 2000 Oct 23; 85(17):3732-5. PubMed ID: 11030993.
    Abstract:
    Resistive or hybrid magnets can achieve substantially higher fields than those available in superconducting magnets, but their spatial homogeneity and temporal stability are unacceptable for high-resolution NMR. We show that modern stabilization and shimming technology, combined with detection of intermolecular zero-quantum coherences (iZQCs), can remove almost all of the effects of inhomogeneity and drifts, while retaining chemical shift differences and J couplings. In a 25-T electromagnet (1 kHz/s drift, 3 kHz linewidth over 1 cm(3)), iZQC detection removes >99% of the remaining inhomogeneity, to generate the first high-resolution liquid-state NMR spectra acquired at >1 GHz.
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