波谱学杂志 ›› 1998, Vol. 15 ›› Issue (3): 223-229.

• 研究论文 • 上一篇    下一篇

用TPPI方法消除2D COSY和MQSY实验中与辐射阻尼有关的谐波峰

陈金鸿, 毛希安   

  1. 中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室, 武汉 430071
  • 收稿日期:1998-01-05 出版日期:1998-06-05 发布日期:2018-01-13
  • 通讯作者: 毛希安,maoxian@nmr.whcnc.ac.cn E-mail:maoxian@nmr.whcnc.ac.cn
  • 作者简介:陈金鸿,男,28岁,博士研究生
  • 基金资助:
    Project supported by the National Natural Science Foundation of China

ELIMINATION OF RADIATION-DAMPING RELATED ARTIFACTS IN2D COSY AND MQSY NMR SPECTRA USING TPPI TECHNIQUE

Chen Jinhong, Mao Xi an   

  1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071
  • Received:1998-01-05 Online:1998-06-05 Published:2018-01-13
  • Supported by:
    Project supported by the National Natural Science Foundation of China

摘要: 在二维相关(COSY)和多量子(MQSY)实验中,TPPI(Time-proportional-phase-in-crement)方法被用于消除与辐射阻尼相关的谐波峰.二维实验中,c/2混合脉冲常常非线性地改变磁化强度的进动相位.这一非线性变化和辐射阻尼一起导致依赖于化学位移偏置的谐波.然而,如果混合脉冲的相位正比于演化时间t1,谐波消失,但水峰保持不变.

关键词: 辐射阻尼, TPPI, 谐波峰, COSY, MQSY

Abstract: Time-proportional-phase-increment (TPPI) techique is used to remove the radiation damping related harmonic peaks from two-dimensional correlation (COSY) and multiple-quantum (MQSY) spectra. In 2D experiments, the mixing c/2 pulse usually changes the phase of the water magnetization nonlinearly. The combination of this nonlinear phase change with radiation damping results in chemical-shift-offset dependent harmonic peaks. However, if the phase of the mixing pulse is proportional to the evolution time t1, the harmonic peaks disappear completely while the water peak remains unchanged.

Key words: Radiation damping, TPPI, Harmonic peaks, COSY, MQSY