摘要
本文提出一个回波序列,它由四个90和一个45脉冲构成,具有较宽的激发带宽和较短的激发时间,可用于氘核NMR固体线型的测量之中,数值计算结果表明该回波序列的激发带宽几乎比传统的四极回波宽一倍。~2D-PMMA粉末样品的实验结果证实了本文设计的回波序列的优越性。
An echo sequence with broad band excitation bandwidth and shortexcitation time is proposed for use in deuterium NMR system in powders, which consists of four 90°pulses and an additional single pulse with flip angle of about 45 ° It is shown by numerical calculations that the excitation bandwidth of the ECHO sequence is nearly twice as broad as that of the conventional quadrupole echo sequence. The superiority of the ECHO sequence over the conventional quadrupole echo sequence is confirmed experimentally by a ~2D - PMMA powder sample.
出处
《波谱学杂志》
CAS
CSCD
1991年第3期333-340,共8页
Chinese Journal of Magnetic Resonance
基金
The project supported by National Natural Science Fundation of China
