利用相位步进脉冲消除探头13C NMR背景信号

doi:10.11938/cjmr20192739

波谱学杂志 ›› 2020, Vol. 37 ›› Issue (1): 123-130.doi: 10.11938/cjmr20192739

• 研究论文 • 上一篇

利用相位步进脉冲消除探头¹³C NMR背景信号

魏令¹, 张善民²

1. 重质油国家重点实验室, 中国石油大学(华东) 化学工程学院, 山东青岛 266580;
2. 上海市磁共振重点实验室, 华东师范大学物理与材料科学学院, 上海 200062

收稿日期:2019-04-17 出版日期:2020-03-05 发布日期:2019-05-27
通讯作者: 魏令,Tel:0532-86984695,E-mail:weiling@upc.edu.cn. E-mail:weiling@upc.edu.cn
基金资助:
国家自然科学基金资助项目（21604094）.

Suppressing Background ¹³C NMR Signal From the Probe Head by Phase Incremented Pulses

WEI Ling¹, ZHANG Shan-min²

1. State Key Laboratory of Heavy Oil Processing & College of Chemical Engineering, China University of Petroleum(East China), Qingdao 266580, China;
2. Shanghai Key Laboratory of Magnetic Resonance, College of Physics and Materials Science, East China Normal University, Shanghai 200062, China

Received:2019-04-17 Online:2020-03-05 Published:2019-05-27

摘要/Abstract

摘要： 由静态探头线圈外有机材料产生的¹³C NMR背景信号强度大，化学位移范围广（δ_C 20~250），此背景信号在交叉极化实验中还可被增强，并随着样品信号的累积而累积，严重影响谱图分析.将相位步进脉冲引入交叉极化实验（称为PIPCP）中可以有效去除经交叉极化增强的¹³C NMR背景信号，但样品信号不受影响.这是由于经过相位步进脉冲后，线圈外相位严重畸变，而且线圈外锁定场强度急剧降低，来自探头材料的¹³C NMR背景信号无法有效地进行交叉极化.而对于被测样品甘氨酸来说，由于I核和S核之间强烈的偶极耦合作用，所加相位步进脉冲对锁定场强度的影响只有1.4%.

关键词: 固体核磁共振, 背景信号消除, 相位步进脉冲, 交叉极化

Abstract: The background ¹³C NMR signal originated from the organic materials in the probe head cross-polarizes from ¹H nucleus to ¹³C nucleus. This background ¹³C NMR signal is very broad (δ_C 20~250) and accumulates as the sample signal accumulating. Hartman-Hahn cross polarization with phase-incremented pulses in the S spin channel (denoted as PIPCP) is developed to suppress this background signal. The application of PIPCP results in severe phase distortion outside the radio frequency coil such that the background ¹³C NMR signal cannot cross polarize and thus be suppressed. In comparison, depending on the dipolar coupling constant between ¹H and ¹³C nuclei, PIPCP induces only a small amount of Hartman-Hahn mismatch (1.4%) to the desired signals.

Key words: solid-state nuclear magnetic resonance, background signal suppression, phase incremented pulses, cross polarization

中图分类号:

O657.61

魏令, 张善民. 利用相位步进脉冲消除探头¹³C NMR背景信号[J]. 波谱学杂志, 2020, 37(1): 123-130.

WEI Ling, ZHANG Shan-min. Suppressing Background ¹³C NMR Signal From the Probe Head by Phase Incremented Pulses[J]. Chinese Journal of Magnetic Resonance, 2020, 37(1): 123-130.

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利用相位步进脉冲消除探头¹³C NMR背景信号

Suppressing Background ¹³C NMR Signal From the Probe Head by Phase Incremented Pulses

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