Bornet, AurelienPinon, ArthurJhajharia, AdityaBaudin, MathieuJi, XiaoEmsley, LyndonBodenhausen, GeoffreyArdenkjaer-Larsen, Jan HenrikJannin, Sami2017-01-242017-01-242017-01-24201610.1039/c6cp05587ghttps://infoscience.epfl.ch/handle/20.500.14299/133357WOS:000388492900034Dissolution 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(C-13) 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, C-13 polarizations on sodium [1-C-13]acetate as high as 64% could be achieved with a polarization build-up time constant as short as 160 s. A polarization of P(C-13) = 78% could even be reached for [C-13]urea.text::journal::journal article::research article