波谱学杂志 ›› 2001, Vol. 18 ›› Issue (4): 357-361.

• 研究论文 • 上一篇    下一篇

相位变形组合π脉冲NMR

高宝华, 杨绪杰*,  陆路德, 汪信   

  1. 南京理工大学计算中心,南京 210094
  • 收稿日期:2001-07-17 修回日期:2001-09-07 出版日期:2001-12-05 发布日期:2001-12-05
  • 作者简介:高宝华(1945-),男,高级工程师. *通讯联系人.

COMPOSITE π PULSES NMR WITH PHASE DISTORTION

GAO Bao-hua, YANG Xu-jie, LU Lu-de, WANG Xin   

  1. Computer Center, Nanjing University of Science and Technology, Nanjing 210094
  • Received:2001-07-17 Revised:2001-09-07 Online:2001-12-05 Published:2001-12-05
  • About author:*Correspondence author

摘要:

描述了相位变形组合π脉冲序列核磁共振,进行了理论分析. 对脉冲角和相位角进行优化,在优化过程中使用了Wigner矩阵元Z22(函数)及函数对脉冲角、相位角的一阶导数. 利用自编子程序DBSLSJ和SOLEQJ代替“IMSL”程序库DBCLSJ进行非线性最小二乘法求极小值点. 计算是在PⅢ PC机上进行,其优化结果和IBM/3600大型计算机计算结果吻合,并优于文献报道的其它组合π脉冲.

关键词: 组合π脉冲, 优化, 计算, 程序

Abstract:

In this article we describe the composite π pulse sequence NMR with phase dis tortion and give a theoretical analysis. During optimization, the elements Z22 of Wigner rotation matrix and it's derivatives with respect to pulse and phase angle were used, and the optimization of  pulse and phase angles were carried out. The subroutines of DB SLSJ an d SOLEQJ were programmed instead of “IMSL”subroutine DBCLSJ to solve the non-linear least square problem and obtain the minimization. The calculations were carried out on PⅢ personal computer. The results show that the optimized values are in agreement with those reported in the reference being obtained from IBM/ 3600 computer and better than those reported using other composite π pulses.

Key words: Composite π pulse, Optimization, Calculation,  Program

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