Overhauser dynamic nuclear polarization for benchtop NMR system using a permanent magnet of 1.56 T
JOURNAL OF THE KOREAN MAGNETIC RESONANCE SOCIETY(2019)
摘要
Overhauser dynamic nuclear polarization (O-DNP) has been an efficient method to boost the thermal nuclear polarization in liquids at room temperature. However, O-DNP for a benchtop NMR using a permanent magnet has remained unexplored yet. In this work, we report the development of an O-DNP system adopting a permanent magnet of 1.6 T. Q-band (similar to 43 GHz) high-power amplifier produced 6 W microwave for saturation. Instead of resonator, we used an open-type antenna for the microwave irradiation. For several representative small molecules, we measured the concentration and frequency dependences of the enhancement factor. This work paves the way for the development of a benchtop DNP-NMR system overcoming its disadvantage of low quality signal when using a permanent magnet.
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关键词
Overhauser dynamic nuclear polarization,Benchtop NMR,Hyperpolarization,permanent magnet
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