Development and Validation of Zero-field NMR Spectrometer Based on Compact Atomic Magnetometer

doi:10.11938/cjmr20233060

Abstract

Abstract:

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

CLC Number:

O482.53

FU Fangyue, GUO Qingqian, FENG Xiaoyu, XU Jiayu, YAO Zekun, HU Tao, YANG Xiaodong, CHANG Yan. Development and Validation of Zero-field NMR Spectrometer Based on Compact Atomic Magnetometer[J]. Chinese Journal of Magnetic Resonance, 2024, 41(1): 87-98.

Figures/Tables 9

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