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Microwave-gated dynamic nuclear polarization.
Physical Chemistry Chemical Physics : PCCP 2016 November 10
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(13 C) 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,13 C polarizations on sodium [1-13 C]acetate as high as 64% could be achieved with a polarization build-up time constant as short as 160 s. A polarization of P(13 C) = 78% could even be reached for [13 C]urea.
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