基于高灵敏度原子磁力计的超低场核磁共振谱学研究  

Study on ultra-low-field nuclear magnetic resonance spectroscopy based on high-sensitivity atomic magnetometer

作　　者：徐文杰 江敏 彭新华 XU Wenjie;JIANG Min;PENG Xinhua(Hefei National Laboratory for Physical Sciences at the Microscale,Hefei 230026, China)

机构地区：[1]合肥微尺度物质科学国家研究中心,安徽合肥230026

出　　处：《中国科学技术大学学报》2020年第8期1138-1143,共6页JUSTC

基　　金：国家重点研究发展计划(2018YFA0306600);国家自然科学基金(11661161018,11927811,12004371);安徽量子信息技术首创(AHY050000);统筹推进世界一流大学和一流学科建设专项资金资助(YD3540002002);中国科学技术大学校青年基金(WK2030000018)资助.

摘　　要：首先从理论上给出超低磁场下核磁共振谱线的频率位置和劈裂规律;然后利用自主研制的基于高灵敏度原子磁力计的超低场核磁共振谱仪开展实验研究,以典型的AXn型有机物分子为例,在零磁场下测量核自旋间的J-耦合谱,结合理论分析精确测量出多种有机物分子的J-耦合参数.对于零磁场下谱线结构相同的化学样品,通过对样品施加微弱的静磁场(~nT量级),观察到不同的样品具有独特的超低场核磁共振谱线劈裂,这可以作为区分化学样品的“指纹”.The frequency of the spectral line and the splitting rule under the ultra-low magnetic field were theoretically given.Then,using the home-built ultra-low-field NMR spectrometer based on a high-sensitivity atomic magnetometer,an experimental study on ultra-low-field NMR spectroscopy was carried out.Taking a typical AXn-type organic molecule as an example,the J-coupling spectra under zero magnetic field was measured and the J-coupling parameters were accurately obtained by combining a theoretical analysis in a variety of organic molecules.For chemical samples with the same spectral structure under zero magnetic field,by applying a weak static magnetic field(nT)to the samples,it was observed that different samples have a unique ultra-low field NMR spectral splitting,which can be used as the"fingerprinting"of the sample to identify them.

关 键 词：超低场核磁共振 J-耦合谱 原子磁力计 

分 类 号：O482.532[理学—固体物理]