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JKMRS Volume 23, No 3, pp 81, Overhauser dynamic nuclear polar...
2019년 09월 22일 / 조회수: 101

Overhauser dynamic nuclear polarization for benchtop NMR system using a permanent magnet of 1.56 T

 

 

Yeon-seong Lee1, Duk-Young Lim1, and Jeong Hyun Shim2,*

 

 

1HMR Co., Ltd, Bucheon 14703, Republic of Korea

2Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea

 

 

 

 

Received Sep 18, 2019; Revised Sep 19, 2019; Accepted Sep 19, 2019

 


Abstract 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 (~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.

 

Keywords Overhauser dynamic nuclear polarization, Benchtop NMR, Hyperpolarization, permanent magnet 

 

* Address correspondence to: Jeong Hyun Shim, Korea Research Institute of Standards and Sciences, Daejeon 34113, Republic of Korea; E-mail: jhshim@kriss.re.kr 

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