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dc.contributor.author林国兴
dc.contributor.author廖新丽
dc.contributor.author林东海
dc.contributor.author郑绍宽
dc.contributor.author陈忠
dc.contributor.author吴钦义
dc.date.accessioned2016-05-17T02:56:25Z
dc.date.available2016-05-17T02:56:25Z
dc.date.issued1999
dc.identifier.citation波谱学杂志,1999,(1):13-20
dc.identifier.issn1000-4556
dc.identifier.otherPPXZ901.002
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/107719
dc.description.abstract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
dc.description.abstractt 1 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 I x,I y,I z 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, t 1 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 3∶11, which is supported by our experimental results.
dc.language.isozh_CN
dc.subjectNMR
dc.subjectDQF-COSY
dc.subject脉冲梯度场
dc.subjectt_1噪声
dc.subject积算符
dc.subjectNMR
dc.subjectDQF COSY
dc.subjectPFG
dc.subjectProduct operator
dc.subjectt 1 noise
dc.title脉冲梯度场增强的DQF-COSY实验t_1噪声研究(英文)
dc.title.alternativeP TYPE GRADIENT ENHANCED DQF COSY EXPERIMENTS SHOW LOWER t 1 NOISE THAN N TYPE *
dc.typeArticle


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