基于小型化原子磁力计的零场NMR波谱仪搭建与测试
收稿日期: 2023-03-26
网络出版日期: 2023-06-05
基金资助
中科院科研装备研制项目(YJKYYQ20210051);苏州市基础研究试点项目(SJC2021024);山东省自然科学基金青年项目(ZR2022QF098)
Development and Validation of Zero-field NMR Spectrometer Based on Compact Atomic Magnetometer
Received date: 2023-03-26
Online published: 2023-06-05
常规高场NMR波谱仪依托超导技术，其体积大、维护成本高，且存在样本磁化率不均匀导致的谱线展宽现象，零场或近零场NMR技术则可实现有效互补．本文自主搭建了一套基于小型原子磁力计的可移动零场NMR波谱仪，采用以多功能采集卡（National Instruments PCIe-6353）为核心的集成控制系统，仪器主磁场强度小于1 nT，可实现高分辨率的J-耦合谱采集．为实现对自旋体系的有效操控，利用样品绝热初态的单脉冲激发实现对三轴脉冲线圈的精确标定．在此基础上，使用改进的组合脉冲序列实现了在13C-1H异核体系下的单自旋选择性操控，验证了零场NMR波谱仪的有效性．
付方跃 , 郭清乾 , 冯晓宇 , 徐佳玉 , 姚泽坤 , 胡涛 , 杨晓冬 , 常严 . 基于小型化原子磁力计的零场NMR波谱仪搭建与测试[J]. 波谱学杂志, 2024 , 41(1) : 87 -98 . DOI: 10.11938/cjmr20233060
Conventional high-field nuclear magnetic resonance (NMR) spectrometer necessitates advanced superconducting technology, which usually involves a magnet of large volume and high maintenance cost. Moreover, strong magnet often has severe magnetic field inhomogeneity, leading to NMR line broadening. Zero- to ultralow-field (ZULF) NMR emerged as a complementary approach to traditional high-field NMR techniques. In this paper, a portable zero-field NMR spectrometer based on a compact atomic magnetometer was developed, which adopted an integrated control system based on a multi-function data acquisition card (National Instruments PCIe-6353). The spectrometer is of a main magnetic field strength less than 1 nT and enables achieving high-resolution J-spectrum under zero-field environment. Specifically, a series of single pulse excitation experiments for the initial adiabatic state was carried out to calibrate the triaxial magnetic field coils. Then a modified composite pulse sequence was developed to further validate the performance of zero-field NMR spectrometer by single-spin control experiments for the 13C-1H spin system.
Key words： zero-field NMR; J-spectroscopy; atomic magnetometer; single-spin control
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