期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 18, 期 44, 页码 30530-30535出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp05587g
关键词
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资金
- Swiss National Science Foundation (SNSF)
- Ecole Polytechnique Federale de Lausanne (EPFL)
- Bruker BioSpin Switzerland
- CNRS
- European Research Council (ERC) [339754]
- European Research Council (ERC) [339754] Funding Source: European Research Council (ERC)
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(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.
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