PFT-NMR相位循环的计算机辅助设计(英文)

COMPUTER-AIDED DESIGN OF PHASE CYCLING IN PFT-NMR EXPERIMENTS^+

本文介绍了通过选择相干传递路径来计算相位循环的理论依据。在此基础上提出了一个计算机程序PHASE.BAS用于计算相位循环。使用此程序设计了一个128步的相循环用于一维和二维INADEQUATE实验。实验结果表明此相循环能很好地消除单量子信号、压制t_1噪声,其效果明显优于Bruker MSL脉冲序列库中的32次循环的结果。

The method of determination of the phase cycle in PFT -NMR experiments from the desired coherence transfer pathway was introduced. A computer program PHASE. BAS used to assist design phase cycling procedure based on this method was proposed. The program has been used to design a 128 step phase cycling procedure for the one and two dimensional INADEQUATE experiments. The one and two dimensional INADEQUATE spectra of n-Butanol were recorded by using this 128 step phase cycling procedure and a 32 step one collected in the Broker MSL Pulse Sequence Library-INADSYMQ. PC respectively. The experimental results show that the former is superior to the latter in suppressing the single quantum signals and eliminating the imperfection of the spectrometer. It seems that the program could be an useful tool in the designing of pulse sequences, especially for the pulse sequences in which huge phase cycle steps are required.