Microwave-gated dynamic nuclear polarization

Aurélien Bornet, Arthur Pinon, Aditya Jhajharia, Mathieu Baudin, Xiao Ji, Lyndon Emsley, Geoffrey Bodenhausen, Jan Henrik Ardenkjær-Larsen, Sami Jannin

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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((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.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Pages (from-to)30530-30535
Number of pages6
Publication statusPublished - 2016


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