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Issue 44, 2016
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Microwave-gated dynamic nuclear polarization

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Dissolution dynamic nuclear polarization (D-DNP) has become a method of choice to enhance signals in nuclear magnetic resonance (NMR). Recently, we have proposed to combine cross-polarization (CP) with D-DNP to provide high polarization P(13C) in short build-up times. In this paper, we show that switching microwave irradiation off for a few hundreds of milliseconds prior to CP can significantly boost the efficiency. By implementing microwave gating, 13C polarizations on sodium [1-13C]acetate as high as 64% could be achieved with a polarization build-up time constant as short as 160 s. A polarization of P(13C) = 78% could even be reached for [13C]urea.

Graphical abstract: Microwave-gated dynamic nuclear polarization

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The article was received on 12 Aug 2016, accepted on 30 Sep 2016 and first published on 30 Sep 2016

Article type: Paper
DOI: 10.1039/C6CP05587G
Citation: Phys. Chem. Chem. Phys., 2016,18, 30530-30535
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    Microwave-gated dynamic nuclear polarization

    A. Bornet, A. Pinon, A. Jhajharia, M. Baudin, X. Ji, L. Emsley, G. Bodenhausen, J. H. Ardenkjaer-Larsen and S. Jannin, Phys. Chem. Chem. Phys., 2016, 18, 30530
    DOI: 10.1039/C6CP05587G

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