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  • Title: Field-cycling NMR experiments in an ultra-wide magnetic field range: relaxation and coherent polarization transfer.
    Author: Zhukov IV, Kiryutin AS, Yurkovskaya AV, Grishin YA, Vieth HM, Ivanov KL.
    Journal: Phys Chem Chem Phys; 2018 May 09; 20(18):12396-12405. PubMed ID: 29623979.
    Abstract:
    An experimental method is described allowing fast field-cycling Nuclear Magnetic Resonance (NMR) experiments over a wide range of magnetic fields from 5 nT to 10 T. The method makes use of a hybrid technique: the high field range is covered by positioning the sample in the inhomogeneous stray field of the NMR spectrometer magnet. For fields below 2 mT a magnetic shield is mounted on top of the spectrometer; inside the shield the magnetic field is controlled by a specially designed coil system. This combination allows us to measure T1-relaxation times and nuclear Overhauser effect parameters over the full range in a routine way. For coupled proton-carbon spin systems relaxation with a common T1 is found at low fields, where the spins are "strongly coupled". In some cases, experiments at ultralow fields provide access to heteronuclear long-lived spin states. Efficient coherent polarization transfer is seen for proton-carbon spin systems at ultralow fields as follows from the observation of quantum oscillations in the polarization evolution. Applications to analysis and the manipulation of heteronuclear spin systems are discussed.
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