| 脉冲梯度场增强的DQF-COSY实验t1噪声研究 |
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| 引用本文： | 林国兴,廖新丽,林东海,郑绍宽,陈忠,吴钦义.脉冲梯度场增强的DQF-COSY实验t1噪声研究[J].波谱学杂志,1999,16(1):13-20. |
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| 作者姓名： | 林国兴 廖新丽 林东海 郑绍宽 陈忠 吴钦义 |
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| 作者单位： | 1.厦门大学化学系, 厦门 361005;2.厦门大学物理系, 厦门 361005 |
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| 基金项目： | 国家自然科学基金，State Key Laboratory for Physical Chemistry of the Solid Surface |
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| 摘 要： | 脉冲相位的不稳定性是导致二维谱中的t1噪声的原因之一.本文从理论上和实验上对脉冲相位不稳定性所引起的t1噪声进行了研究.从角动量算符Ix,Iy和Iz推导中发现,由于磁化矢量在P型和N型DQF-COSY实验的脉冲梯度场中进动方向的内在差异,一部分脉冲相位误差在P型DQF-COSY实验会被重聚掉,在N型DQF-COSY实验中却会被加重.因此P型DQF-COSY实验的t1噪声比N型小.理论推导还得到t1噪声在P型和N型中的理论比值为√3:√11.以上理论结果得到我们实验结果的支持.
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| 关 键 词： | NMR DQF-COSY 脉冲梯度场 t1噪声 积算符 |
| 收稿时间： | 1998-09-21 |
P-TYPE GRADIENT-ENHANCED DQF-COSY EXPERIMENTS SHOW LOWER t1 NOISE THAN N-TYPE |
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| Lin Guoxing,Liao Xinli,Lin Donghai,Zheng Shaokuan,Chen Zhong,Wu Qinyi.P-TYPE GRADIENT-ENHANCED DQF-COSY EXPERIMENTS SHOW LOWER t1 NOISE THAN N-TYPE[J].Chinese Journal of Magnetic Resonance,1999,16(1):13-20. |
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| Authors: | Lin Guoxing Liao Xinli Lin Donghai Zheng Shaokuan Chen Zhong Wu Qinyi |
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| Institution: | Department of Chemistry, Xiamen University, Xiamen 361005 |
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| Abstract: | t1 noise, stemming from the instabilities of pulse phases in 2D spectroscopy, has been investigated theoretically as well as experimentally. Based on the angular momentum operator Ix,Iy,Iz formalism, our deductions show that the different precessing directions of the magnetization between P-type and N-type gradient-enhanced DQF-COSY experiments result in that P-type gradient-enhanced DQF-COSY experiments refocus the phase errors of pulses, while N-type gradient-enhanced DQF-COSY experiments strengthen the effect of the phase errors of pulses. Therefore, t1 noise in P-type gradient-enhanced DQF-COSY experiments is lower than that in N-type. In addition, the theoretical ratio of P-type to N-type is , which is supported by our experimental results. |
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| Keywords: | NMR DQF-COSY NMR DQF-COSY PFG Product operator t1 noise |
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